Welcome to our database for 1978-1987 Chevy El Caminos and GMC Caballeros.

The fifth generation El Camino started production in 1978, adopting the new Malibu styling, suspension parts, and a one-inch longer wheelbase of 117 in. The front end sheet metal and doors (two door Malibus) were shared with the Malibu, although the window glass was different. The rear bumper was shared with the Malibu station wagon, although the tailgate was not, contrary to popular reporting. The station wagon tailgate is roughly the same but has differences like an exterior latch. For the first time, though, the El Camino had a unique chassis shared with no other Chevrolet. The floorboard design is mostly shared with the wagon, up to the end of the cargo location. Rear air shocks were standard equipment so that the car-like ride would be preserved until hauling capability was needed, when the shocks could be aired up. The frame of the El Camino is not the same one used in the station wagon.

The Malibu sedan and station wagon ceased production after the 1983 model year, as well as their cousins in other GM lines such as Pontiac and Oldsmobile. In 1985 GM shifted El Camino production to Mexico.

El Camino production ended in late 1987. Some model year 1987's (420 El Caminos and 325 GMC Caballeros) are listed as new car retail deliveries in calendar year 1988 based on their date of first retail sale. GM chose not to continue the El Camino platform for several reasons: a suitable rear-drive platform was not available at the time with GM's switch to mainly front-drive platforms, and GM claimed waning interest in the El Camino although sales charts do not back this up as sales were steady until GM announced the discontinuation of the platform.

The GMC version of the El Camino was virtually identical, except for a few small cosmetic and naming differences to rebadge the product as a GMC.

The El Camino was produced in plants located in: Baltimore, MD, Doraville, GA, Leeds, MO, Arlington, TX, Fremont, CA, Oshawa, Ontario, Canada, and Ramos Arizpe, Mexico.

From 1978 through 1981, The El Camino was technically still called an 'A' body by GM. It wasn't until 1982 that the 'G' body designation took effect officially. From 1978 to 1982, the model designation for the El Camino was AW80, and from 1982 to 1987 the model designation was GW80.

In the articles that follow, please note that any RPO (Regular Production Option) codes we list are confirmed to be appropriate by either GM paperwork or by indivvidual build sheets. Obviously there may be some holes in this information but we are always updating this site and endeavoring to make our lists more complete.

All years 1978-1987:
-Angle of approach: 23.5 degrees
-Angle of departure: 17.5 degrees
-Axle shaft: integral shaft and drive flange
-Body mounting: 7 each side of frame, 10 double cushion and 4 single cushion
-Brakes: Hydraulic, self-adjusting, power assisted, 10.5in. X 1.03in. front cast-iron vented disc, 9.5 in. x 2 in. rear cast-iron finned drum
-Brake master cylinder: dual resevoir (front/rear split)
-Brake booster: Delco two-diaphragm, 7.9in. X 7.9in. nominal diameter, vacuum/hydraulic
-Control arms: reinforced stamped steel with pre-loaded steel-encased rubber bushings at pivot
-Driveline type: tubular exposed, single, 2 Cardan universal joints with pre-packed anti-friction bearings
-Door beams: saftey guard
-Effective head room: 37.6 in.
-Electrical: 12v negative ground
-Exhuast: single aluminized
-Exterior paint type: acrylic lacquer
-Frame: Carbon steel, perimeter type, sigma-section rails, welded front and rear crossmembers with bolt-in tubular transmission support
-Front shock absorbers: direct, double-acting hydraulic
-Front spindle: 3/4-20 UNEF 3-A modified
-Front suspension: independant; coil springs and 1" shock absorbers
-Front wheel bearings: taper roller, two per spindle, inner 1.25in, outer .8437-.8445in
-Fuel fill: left-hand fill, rectangular
-General suspension provisions, leveling: front stabilizer bar
-General suspension provisions, anti-dive control: front suspension geometry
-General suspension provisions, anti-squat control: rear suspension geometry
-Generator: 37 amp
-Height: 55.4 in.
-Height rocker panel rear to ground: 9.9 in.
-Inner fenders: plastic
-Length: 201.6 in.
-Lowest ground clearance: rear shock absorber bracket
-Lugs: 7/16-20 UNF 2B on 4.75in. bolt circle diameter
-Minimum running ground clearance: 6.3 in.
-Parking brake: pedal-operated, cable to rear wheels, 63.73 sq. in. facing contact per axle
-Ramp breakover angle: 14.5 degrees
-Rear axle: Salisbury-type, hypoid gearing
-Rear axle differential to ground: 12.2 in.
-Rear axle gearing: positraction available on all ratios (2.29, 2.41, 2.56, 2.73, 3.08), 7.5" ring gear pitch diameter
-Rear axle housing: 2.53 in. X 0.18 in. section diameter and thickness at spring seat
-Rear bumper to ground: 14 in.
-Rear overhang: 48.5 in.
-Rear suspension: hypoid; coil springs, 1" air boosted shock absorbers
-Rocker panels: open channel
-Roof: halo construction
-Seat cushions and backrests: formed polyfoam
-Shoulder room: 51.7 in
-Spare tire: full size standard
-Steering: manual recirculating ball, parallelogram linkage
-Steering knuckles: nodular iron with integral steering knuckle arm
-Turning diameter outside front, curb to curb: 42.66 ft.
-Turning diameter outside front, wall to wall: 39.89 ft.
-Wheelbase: 117.1 in.
-Wheels: 5 lug, 14"x6"
-Width with doors open: 157.6 in.
-Windshield pillars: energy absorbing air-gap construction

1978:
-Fuel tank: 17.5 gallon
-Battery: 2500w @ 0 deg F

1979:
-Fuel tank: 17.7 gallon
-Battery: 3200w @ 0 deg F

1980:
-Battery: 2500w @ 0 deg F
-Fuel tank: 17.7 gallon

1981:
-Fuel tank: 17.7 gallon

1982:
-Automatic transmissions had optional 3rd gear lock-up torque converter clutch
-Fuel tank: 17.7 gallon

1983:
-Diesel versions: Dual batteries, 63 amp alternator, TH350 transmission with ratios: 2.52/1.52/1/Rev 1.93 with 27 spline yoke
-Battery: (now rated in CCA), 355 Cold Cranking Amps at 0 degrees F.
-Fuel tank: 17.7 gallon, 22 gallon (not available with Diesel engine)

1984:
-Battery: 355 Cold Cranking Amps at 0 degrees F.
-Fuel tank: 17.7 gallon

1985:
-Battery: 630 Cold Cranking Amps at 0 degrees F.
-Fuel tank: 17.7 gallon

1986:
-Battery: 630 Cold Cranking Amps at 0 degrees F.
-Fuel tank: 17.4 gallon

1987:
-Battery: 630 Cold Cranking Amps at 0 degrees F.
-Fuel tank: 17.7 gallon

Notes: Although the nominal fuel tank size seems to vary somewhat from year to year, this is probably due to measuring error taken each year for production and EPA specifications. In reality the same base fuel tank was most likely used throughout production.

Cargo box specifications:
-Cargo weight rating: 800 lbs.
-Cargo box area: 35.5 cubic feet
-Maximum width: 59.1in.
-Maximum length: 79.1 in.
-Width between wheel wells: 45 in.
-Tailgate loading width: 53.1 in.
-Construction: double-walled, ribbed steel
-Liftover height: 25.2 in.

Paint and body process (from GM documentation):
1. RUSTPROOFING. Assembled car bodies are chemically sprayed to clean and etch the metal surfaces for corrossion resistance and paint adhesion. Unassembled sheet metal parts follow the same process.
2. BODY PRIMERS. Four corrosion resistant primers, specially formulated, are hand sprayed on the body in areas where rust might develop. Lower areas considered especially vulnerable are coated with another rust inhibiting compound.
3. SHEET METAL PRIMER is applied to all outside and inside surfaces of front fenders and hoods. The parts are mechanically dipped or flow-coated to insure coating in all seams and secluded areas, and baked at 390 degrees F. for 30 minutes. A coat of sealer is then applied by hand spray to all surfaces requiring lacquer.
4. FLASH PRIMER AND PRIMER SURFACER COATS. An air-dry flash primer caot is hand sprayed on surfaces below the body belt line. Then a gray primer-surfacer coat is hand sprayed on all outside surfaces of the body and ove baked for 45 minutes at 285 degrees F.
5. INITIAL SANDING. Power wet sanding, followed by hand sanding is done on all body surfaces requiring lacquering. This insures a smooth surface for the lacquer finish. To remove the water, the body is wiped and run through an infrared oven.
6. LACQUERING. Three coats of acrylic lacquer are applied on the exterior surfaces of the body and sheet metal parts to build up a finish of the required thickness and color.
7. INITIAL BAKING. To harden the paint for two tones, the body and sheet metal parts are baked for approximately 10 minutes at 200 degrees F.
8. FINAL BAKING. To assure a durable, hard, high luster finish the lacquer is baked for 30 minutes at 325 degrees F. Reheating the lacquer permits paint film to soften, allowing surface blemishes to disappear during the thermo-flow process.
9. UNDERCOATING. To block out road noise, an asbestos fiber sound deadener with asphalt base is sprayed inside the wheel housings and on the bottom of the underbody at designated areas.
10. PAINT REPAIR AND PROTECTION. Mars, nicks, or scratches that occur during final assembly are corrected at the factory before shipment. When required, light "slush" polishing brings painted surfaces to a high luster finish. Wax is applied to all horizontal surfaces of each vehicle and polished out for protection during shipment. The wax contains no silicones, thus eliminating any paint contamination problem.

Body glass:
-Windshield visibility area: 1361.8 sq. in.
-Front door window visibility area: 1076.3 sq. in.
-Rear quarter window visibility area: 787 sq. in.
-Back window visibility area: 79.62 sq. in.
-Total sq area: 2951.9 sq. in.
-Backlight slope angle: 20.0 degrees
-Windshield slope angle: 58.5 degrees
-Tumble-home: 23.5 degrees
-Windshield type: curved laminated plate
-Side glass type: curved tempered plate
-Rear glass type: curved tempered plate

Vinyl roofs:
Dealer documentation specifies that at least for several years, vinyl roofs in various colors were available. For fifth generation El Caminos this seems to have been a rarely-ordered option as we have encountered exactly zero of these up to this date. If you have any verified photographs of 1978-1987 vinyl roofs, please send them to us so we can provide evidence of actual production cars!

1978:
-One headlamp each side introduced. Chevrolet nameplate on chrome grille on upper driver's side, "Chevrolet" block letters outlined against a black background. One-year-only tail lamps with backup lights in outboard side.

1979:
-Restyled grille with finely graduated rectangular openings and a more pronounced vertical center bar, Chevrolet nameplate relocated to lower left portion of grille opening. New colors offered. Tail lamps redesigned by moving backup light to inboard position. 231 cubic inch Buick V6 eith "closed loop" emissions for California introduced. 267 cubic inch V8 RPO L39 introducted except in California. 305 cubic inch 4bbl RPO LG4 replaces 305 cubic inch 2bbl RPO LG3. RPO UN3 introduced, AM/FM radio with cassette. RPO UP5 introduced, CB AM/FM monoaural radio. RPO UP6 introduced, CB AM/FM stereo radio. RPO UY8 introduced, AM/FM stereo radio with clock and digital display. Instrument cluster bezel now color keyed. Light smoke gray beads used on instrument cluster face. Bright finish beads used on the radio/HVAC panel and optional floor console.

1980:
-Hood ornament introduced, emblem moved from upper grille center to ornament on grille header panel. Grille changed to vertical bar style. Front fenders received marker lights starting this year.

1981:
-Restyled grille with horizontal bars. All gas engines get Computer Command Control (CCC). Restyled Instrument panel pad, international symbols on controls, model nameplates on dash pad. Doors now get pull straps. Standard full wheelcovers have new diamond pattern.

1982:
-Restyled grille with 'crosshatch' design. Headlights changed to quad style. "Silver Gray" interior color available for first time.

1983:
-Diesel engine from Oldsmobile first offered in El Caminos.

1984:
-Last year for Diesel engine from Oldsmobile in El Caminos.

1985:
-New full wheelcover design for base models. New 4.3 Fuel Injection engine and nameplate on tailgate. New halogen high and low beam headlamps. 305 cubic inch engines now receive Electronic Spark Control (ESC). 4-speed automatic transmission available.

1986:
-Steering wheel change to 'flat' spoke design with outboard horn buttons.

1987:
-1986 and 1987 vehicles were virtually the same design, even according to documentation GM sent to dealers.

Style differences in bench seat designs. Note that of course colors and materials always varied:

Style differences in steering wheel designs. Note that color always varied, and 78-85 wheels had a trim ring around the wheel perimeter as well as a different horn button:

Style differences in shifter designs:

Style differences in gauge clusters:
-1978, 1979, 1980, 1981 had base linear speedometers, fuel guage, and dummy lights. The UF7 option gave round guages with a clock. The U14 option gave round gauges with a tachometer and nested clock. Note that from 1980 onward the '55' in MPH was red-highlighted.



-1982, 1983, 1984, 1985 clusters had a base cluster with round guages, however only speedometer and fuel; the rest were dummy lights. The upgraded options were the same as previous years.



-1986, 1987 clusters had a newer font. The base cluster had speedometer and fuel guage. U39 added temperature, voltage, and oil pressure guages, U35 placed a clock on the right (with the clock font unchanged), U16 placed a tachometer there. In '86 and '87 both clock and tachometer could NOT be ordered simultaneously.

1978:
-200 cubic inch 2bbl Chevrolet V6 rated at 95 hp @ 3800 RPM and 160 lb-ft @ 2000 RPM (base engine)
-231 cubic inch 2bbl Buick V6 rated at 105 hp @ 3400 RPM and 185 lb-ft @ 2000 RPM(California base engine)
-305 cubic inch 2bbl V8 rated at 145 hp @ 3800 RPM and 245 lb-ft @ 2400 RPM
-305 cubic inch 2bbl V8 rated at 135 hp @ 3800 RPM and 240 lb-ft @ 2000 RPM (California only)
-350 cubic inch 4bbl V8 rated at 170 hp @ 3800 RPM and 270 lb-ft @ 2400 RPM (El camino, station wagons, and 9C1 package only)
-350 cubic inch 4bbl V8 rated at 160 hp @ 3800 RPM and 260 lb-ft @ 2400 RPM (California only, El camino, station wagons, and 9C1 package only)

1979:
-200 cubic inch 2bbl Chevrolet V6 rated at 94 hp @ 4000 RPM and 154 lb-ft @ 2000 RPM (base engine)
-231 cubic inch 2bbl Buick V6 rated at 115 hp @ 3800 RPM and 190 lb-ft @ 2000 RPM (California base engine)
-267 cubic inch 2bbl V8 rated at 125 hp @ 3800 RPM and 215 lb-ft @ 2400 RPM
-305 cubic inch 4bbl V8 rated at 160 hp @ 4000 RPM and 235 lb-ft @ 2400 RPM
-305 cubic inch 4bbl V8 rated at 155 hp @ 4000 RPM and 225 lb-ft @ 2400 RPM (California only)
-350 cubic inch 4bbl V8 rated at 165 hp @ 3800 RPM and 260 lb-ft @ 2400 RPM (El camino, station wagons, and 9C1 package only)

1980:
-229 cubic inch 2bbl Chevrolet V6 rated at 115 hp @ 4000 RPM and 175 lb-ft @ 2000 RPM (base engine)
-231 cubic inch 2bbl Buick V6 rated at 110 hp @ 3800 RPM and 190 lb-ft @ 1600 RPM (California base engine)
-267 cubic inch 2bbl V8 rated at 120 hp @ 3600 RPM and 215 lb-ft @ 2000 RPM
-305 cubic inch 4bbl V8 rated at 155 hp @ 4000 RPM and 240 lb-ft @ 1600 RPM
-305 cubic inch 4bbl V8 rated at 155 hp @ 4000 RPM and 230 lb-ft @ 2400 RPM (California only)
-Note: this is the last year for a different 305 for California. After this all 305's were configured for the same output.

1981:
-229 cubic inch 2bbl Chevrolet V6 rated at 110 hp @ 4200 RPM and 170 lb-ft @ 2000 RPM (base engine)
-231 cubic inch 2bbl Buick V6 rated at 110 hp @ 3800 RPM and 190 lb-ft @ 1600 RPM (California base engine)
-267 cubic inch 2bbl V8 rated at 115 hp @ 4000 RPM and 200 lb-ft @ 2400 RPM
-305 cubic inch 4bbl V8 rated at 145 hp @ 3800 RPM and 240 lb-ft @ 2400 RPM (California AND non-California the same)

1982:
-229 cubic inch 2bbl Chevrolet V6 rated at 110 hp @ 4200 RPM and 170 lb-ft @ 2000 RPM (base engine)
-231 cubic inch 2bbl Buick V6 rated at 110 hp @ 3800 RPM and 190 lb-ft @ 1600 RPM (California base engine)
-267 cubic inch 2bbl V8 rated at 115 hp @ 4000 RPM and 205 lb-ft @ 2400 RPM
-305 cubic inch 4bbl V8 rated at 150 hp @ 3800 RPM and 240 lb-ft @ 2400 RPM (California AND non-California the same)

1983:
-229 cubic inch 2bbl Chevrolet V6 rated at 110 hp @ 4200 RPM and 190 lb-ft @ 1600 RPM (base engine)
-231 cubic inch 2bbl Buick V6 rated at 110 hp @ 3800 RPM and 190 lb-ft @ 1600 RPM (California base engine)
-305 cubic inch 4bbl V8 rated at 145 hp @ 4000 RPM and 240 lb-ft @ 1600 RPM (California AND non-California the same)
-350 cubic inch fuel injection Diesel V8 rated at 105 hp @3200 RPM and 200 lb-ft @ 1600 RPM (California AND non-California the same)
-Note: the 5.7-liter Diesel V8 was made by Oldsmobile, which was also offered in Chevrolet's full-size cars. The Diesel was an attempt at better fuel mileage with higher torque than a small engine, but developed a bad reliability record because GM released it too quickly with insufficient testing and too much cost-cutting. Unfortunately by the time latent issues were worked out, it had developed a bad reputation and it was too late.

1984:
-229 cubic inch 2bbl Chevrolet V6 rated at 110 hp @ 4000 RPM and 190 lb-ft @ 1600 RPM (base engine)
-231 cubic inch 2bbl Buick V6 rated at 110 hp @ 3800 RPM and 190 lb-ft @ 1600 RPM (California base engine)
-305 cubic inch 4bbl V8 rated at 150 hp @ 4000 RPM and 240 lb-ft @ 2400 RPM (California AND non-California the same)
-350 cubic inch fuel injection Diesel V8 rated at 105 hp @3200 RPM and 200 lb-ft @ 1600 RPM (no longer offered in California)

1985 and 1986:
-262 cubic inch fuel injection (TBI) V6 rated at 130 hp @ 3600 RPM and 210 lb-ft @ 2000 RPM (California AND non-California the same)
-305 cubic inch 4bbl V8 rated at 150 hp @ 4000 RPM and 240 lb-ft @ 2000 RPM (California AND non-California the same)

1987:
-262 cubic inch fuel injection (TBI) V6 rated at 145 hp @ 4200 RPM and 225 lb-ft @ 2000 RPM (California AND non-California the same)
-305 cubic inch 4bbl V8 rated at 150 hp @ 4000 RPM and 240 lb-ft @ 2000 RPM (California AND non-California the same)

-RPO -- Size and notes -- years available
-L26 -- 3.3L (200 cubic inch) 2bbl V6 -- 1978, 1979
-L39 -- 4.4L (267 cubic inch) 2bbl V8 -- 1979, 1980, 1981, 1982
-LB4 -- 4.3L (262 cubic inch) TBI (Throttle Body Injection) V6 -- 1985, 1986, 1987
-LC3 -- 3.8L (229 cubic inch) 2bbl V6 -- 1980, 1981, 1982, 1983, 1984
-LC6 -- 3.8L (231 cubic inch) 2bbl V6 Buick -- 1979
-LD5 -- 3.8L (231 cubic inch) 2bbl V6 Buick -- 1978, 1980, 1981, 1982, 1983, 1984
-LF9 -- 5.7L (350 cubic inch) fuel injection V8 Diesel -- 1983, 1984 more information
-LG3 -- 5.0L (305 cubic inch) 2bbl V8 -- 1978
-LG4 -- 5.0L (305 cubic inch) 4bbl V8 -- 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-LM1 -- 5.7L (350 cubic inch) 4bbl V8 -- 1978, 1979

For two years, 1983 and 1984, the 350 cubic inch Oldsmobile Diesel was offered in the El Camino. According to Bernie Vascotto at GMHC (General Motors Heritage Center) using historical records in the archives, out of 22,429 El Caminos built in 1983, 571 were built with the LF9 Diesel option. In 1985 out of 22,244 El Caminos built, 98 were built with the LF9 Diesel.

For those questioning whether the Diesel option could be ordered on the SS trim level, several owners have come forward with probable evidence that the Diesel could indeed be ordered on the SS package.

Oldsmobile was given the passenger car Diesel development project, possibly because GM often let Olds introduce new technologies such as the Hydramatic transmission and front-wheel drive.

The Diesel had to be ordered with some very specific mechanical options, such as dual batteries and particular suspension. Since the SS was merely a trim option by those years, it is perfectly logical that the SS could be had easily with a Diesel.

Because of the very few of these built, and only being offered for two years, this is one of the rarer El Camino models available.

Much has been written about the history of these engines, but by the time these were put in El Caminos the engine was in its last years. These engines have a much better reputation than their earlier brethren with many, if not all, of the issues being resolved by that time.

The LF9 Diesel engine was the only passenger-car V-8 diesel in the world at that time; engineered by Oldsmobile. Today it is remembered as a converted gas engine, but that is not the case. While manufacturing efficiencies dicated it share some things like head-bolt locations and other machining points with gas engines, the block was a unique high-nickel-content iron casting. It had larger bulkhead and main-bearing sections also.

The compression ratio was 22.5:1. The crankshaft was nodular iron, and although the connecting rods started as 403 gas-engine pieces, they had beefier ends and rods, and were a different length. Pistons were made from special high-strength cast aluminum by Bohn. The engine used glow plugs on a timer system, and a 10hp starter motor. 1981 added a roller cam and lifters, so all El Caminos would have had these.

The engine used mechanical fuel injection by the Roosamaster division of Stanadyne Corporation. The engines redline was 4,000 RPM. These engines were not NVH (noise, vibration, and harshness) suitable for passenger vehicles even though GM added an extra layer of sound deadening on the firewall in many of these vehicles. They are not quiet like modern passenger car Diesels, and sound like a large truck engine.

Although very low horsepower, they had respectable torque numbers. Acceleration was not great, and the engine is always panned for this. They did get great fuel mileage though, reported to be on average in mid to high 20 MPG in some cases. The Diesel was pretty much dropped into the GM model line-up with very few transmission or gearing adjustments. Without these changes, the resulting performance could never match a gas engine.

One problem that developed were broken or stretched head bolts resulting in blown head gaskets. They had 10 TTY (torque-to-yield) head bolts on each side, shared with the gas engines. Being TTY, they could not be reused and it is reported that some mechanics did not know this, causing issues later. It is also generally accepted that these 10 bolts were not enough for the high compression ratio, resulting in a lack of longevity and premature failure.

Another issue was the chain on the mechanical fuel-injector pump stretching with normal use causing late fuel delivery. Since Diesel engines rely considerably on fuel delivery timing, this was a big issue and not necessarily easily diagnosed.

Additionally there was the problem of car owners not being familiar with Diesel engine requirements, and using the wrong engine oil. This resulted in bearing failures and other lubrication-related problems.

A larger issue was that a water separator was not included on the early fuel systems, causing corrosion issues inside the fuel system. To counteract this some owners added drygas (anhydrous alcohol) to the fuel, but the alcohol reacted with the governor rings inside the injection pump causing the rings to flake off in chunks and block the fuel lines.

Reportedly dealership mechanics were inadequately educated on these engines, compounding and amplifying all these issues.

The 1981-up engines with DX blocks were improved in many areas, including water filtration and a roller cam as well as other small details. All of the Diesel engines used in EL Caminos would have had the improved engines.

The Oldsmobile Diesel was discontinued in 1985 with more than a million units sold overall, but it was already discontinued in the El Camino line after 1984.

-RPO -- ratio -- year notes (found on build sheets)
-GH2 -- 2.29
-GM8 -- 2.56 -- 1982
-GU1 -- 2.41 -- 1979, 1980
-GU2 -- 2.73
-GU4 -- 3.08

-RPO -- description
-G80 -- Positraction limited slip differential
-G84 -- High altitude ratio, only available with NA6 emissions and LC3 engine, 1983 only
-G92 -- Performance ratio option

Notes: The G92 and G84 options were only available in certain powertrain combinations, and only specified a numerically higher axle ratio that was already a stand-alone option. Most likely used for easier standard package specification by GM.

Note: specific 3-speed automatic transmission type for RPO MX1 assignment seems to have depended on axle ratio selected. In early years GM seems to have switched and swapped transmissions as necessary to obtain the total torque multiplication desired, rather than re-gear transmissions for individual applications.
Note: not all the RPO codes listed here may necessarily apply to the El Camino, but all apply to 'A' and 'G' bodies 1978-1987.

-RPO -- description
-D1A -- Speedometer Gear
-D1D -- Speedometer Gear
-E5Z -- No Speedometer Adapter
-E6E -- Speedometer Sleeve
-E9Z -- Less Speedometer Key
-M15 -- 3-speed manual
-M20 -- 4-speed manual, 117mm, 6.55 ratio
-M21 -- 4-speed manual close ratio, 82mm, 2.43 ratio
-M24 -- 4-speed manual
-M29 -- THM200C, 3-speed automatic
-M31 -- THM250C, 3-speed automatic
-M33 -- 3-speed automatic transmission
-M38 -- THM350C, 3-speed automatic
-M64 -- 3-speed manual, 76mm, 3.50 ratio
-M67 -- 4-speed manual
-MD8 -- THM700R4, 4-speed automatic with overdrive
-MM3 -- specifies 3-speed manual option, non-specific type
-MM4 -- specifies 4-speed manual option, non-specific type
-MV4 -- THM350C, 4-speed automatic (lock-up torque converter?)
-MV9 -- THM200C, 3-speed automatic
-MW9 -- THM2004R, 4-speed automatic with overdrive
-MX1 -- specifies 3-speed automatic option, non-specific type, either 200C or THM250 or THM350, may be lock-up torque converter
-MX0 -- specifies 4-speed automatic option, non-specific type, either 2004R or 700R4
-MX2 -- THM350C, 3-speed automatic

Note: for an RPO cross-reference, see here

-RPO -- Engine uses

1978:
-M15 -- 200, 231
-M29 -- 200, 231, 305, 350
-M38 -- 200, 305, 350
-M20 -- 231, 305, 350
-M21 -- 350
-M33 -- 231

1979:
-M15 -- 200, 231
-M29 -- 200, 305, 350
-M38 -- 200, 305, 350
-M20 -- 305, 350
-M21 -- 350

1980:
-M20 -- 305
-MV4 -- 305
-M31 -- 305
-M33 -- 231, 305
-M38 -- 267, 305
-MV9 -- 229
-??? (3-speed manual -- 229)

1981:
-MX2 -- 231
-M31 -- 229, 231, 267, 305
-MV9 -- 229, 231, 267, 305
-M38 -- 229
-M64 -- 229
-MV4 -- 267, 305
-M33 -- 267, 305
-MW9 -- 305
-M67 -- 305
-M24 -- 305

1982:
-MV4 -- 229, 267, 305
-M31 -- 229, 267, 305
-MW9 -- 267, 305
-MD8 -- 305
-Note: No 231 V6 option listed, but was available in dealer paperwork. 1982 Buick 231 California emissions got MX2 or M31.
-Note: Overdrive transmissions listed here, although not shown as available in dealer paperwork.

1983:
-MX2 -- 231, 305, 350 Diesel
-M31 -- 229, 231, 305
-MW9 -- 229, 305, 350 Diesel
-MD8 -- 305
-Note: Overdrive transmissions listed here, although not shown as available in dealer paperwork.

1984:
-MV4 -- 305
-M31 -- 229, 305
-MW9 -- 229, 231, 305, 350 Diesel
-MV9 -- 231, 350 Diesel
-MD8 -- 305
-Note: Overdrive transmissions listed here, although not shown as available in dealer paperwork.

1985:
-MW9 -- 262, 305
-MV9 -- 231, 305, 262
-MD8 -- 262, 305

1986:
-MW9 -- 262, 305
-MV9 -- 231, 262, 305
-MD8 -- 262, 305

1987:
-MW9 -- 305
-MV9 -- 231
-MD8 -- 305
-Note: No 262 V6 option listed, but was available in dealer paperwork.

-RPO -- description -- years available
-1AW -- Tire Pressure Label -- 1978, 1979
-55P -- Wheel trim: Wheel Covers, Sport (Gold) -- 1978, 1979, 1980, 1981, 1982
-N95 -- Wheel trim: Wheel Covers, Wire -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
-N91 -- Wheel trim: Wheel Covers, Wire, With locks -- 1986, 1987
-N18 -- Wheel cover locking package, only with N95 wire wheels -- 1982, 1983, 1984, 1985
-P01 -- Wheel covers -- 1979
-PB2 -- Wheel trim: Wheel Covers, Sport (Silver, styled plastic) -- 1978, 1979, 1980, 1981, 1982, 1983
-QKH -- Tires: P205/75 R-14-B Blackwall (Radial) -- 1978
-QKJ -- Tires: P205/75 R-14-B Whitewall (Radial) -- 1978
-QKK -- Tires: P205/75 R-14-B White Lettered -- 1978
-QJZ -- Tires: P205/75 R-14-B Blackwall (Radial) -- 1979, 1980
-QJY -- Tires: P205/75 R-14-B White Stripe (Radial) -- 1979, 1980
-QKL -- Tires: P205/75 R-14-B White Lettered (Radial) -- 1979, 1980
-QXX -- Tires: P205/75 R-14-B Blackwall (Radial) -- 1981, 1982, 1983
-QXY -- Tires: P205/75 R-14-B White Stripe (Radial) -- 1981
-QXZ -- Tires: P205/75 R-14-B White Lettered (Radial) -- 1981, 1982, 1983
-QVT -- Tires: P205/75 R-14-B White Stripe (Radial) -- 1982, 1983
-QFT -- Tires: P205/75 R-14-B Blackwall (Radial) -- 1984, 1985, 1986, 1987
-QJR -- Tires: P205/75 R-14-B Whitewall (Radial) -- 1984, 1985, 1986, 1987
-QSA -- Tires: P205/75 R-14-B White Lettered -- 1984, 1985, 1986, 1987
-ZJ7 -- Wheels, Rally, some years color-keyed (styled steel wheels, special hub caps and trim rings) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987

Notes: Blackwall tires were the base option for El Caminos. Rally wheels were the 'rectangular' hole style in 1978, 1979, 1980, 1981. 'Triangle' hole style rally wheels were used thereafter.

-RPO -- description -- years available
-U58 -- AM/FM Stereo Radio -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
-U63 -- AM Radio -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-U69 -- AM/FM Radio -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
-U73 -- Fixed mast antenna -- 1982, 1983, 1984, 1985, 1986, 1987
-U75 -- Power antenna -- 1978, 1979, (1980 assumed), 1981, 1982
-U76 -- Windshield antenna -- 1978, 1979, 1980, 1981
-UK4 -- Electronically tuned AM/FM Stereo Radio with seek and scan -- 1986
-UL6 -- AM Radio with digital clock -- 1986, 1987
-UM1 -- AM Stereo Radio with stereo 8-track -- 1978, 1979, 1980
-UM2 -- AM/FM Stereo Radio with stereo 8-track -- 1978, 1979, 1980, 1981, 1982
-UM7 -- Electronically tuned AM/FM Stereo Radio with seek and scan and digital clock -- 1986, 1987
-UM6 -- Electronically tuned AM/FM Stereo Radio with seek and scan, stereo cassette tape and digital clock -- 1986, 1987
-UN3 -- AM/FM Stereo Radio with stereo cassette -- 1979, 1980, 1981, 1982, 1983, 1984, 1985
-UN9 -- Radio Supression -- 1978, 1980
-UP5 -- AM/FM/CB Radio with power antenna, only with UX6 -- 1979, 1980
-UP6 -- AM/FM/CB Radio with power antenna -- 1979, 1980, 1981
-UX1 -- Electronically tuned AM/FM Stereo Radio with seek and scan, stereo cassette tape with search and repeat, graphic equalizer and digital clock -- 1986, 1987
-UX6 -- Dual front speakers, incl. with U58, UM1, UM2, UN3, UY8 -- 1978, 1979, 1980
-UY8 -- AM/FM Stereo Radio with digital clock display -- 1979, 1980

Notes: Windshield antenna was not available from 1982 onward, fixed mast antennas were used instead. Power antennas were not available after 1982.

Question: did dual front speakers become standard from 1981 onward? Please let us know if you have any supporting documentation either way.

-Note that for emissions purposes, it seems the El Camino was classified as a 'passenger car' not a 'light truck' as GM usually calls it.
-RPO -- description -- year notes
-K19 -- Air System (air injection reaction system) -- 1982
-N23 -- Tank, Fuel: 22 gallons
-NA2 -- Emissions Systems: Standard Emission Equipment
-NA5 -- Emissions Systems: Standard Emission Equipment
-NA6 -- Emissions Systems: High Altitude Emission Equipment -- 1978(only available for MX1 and LM1 combination), 1983(only available for LC3 and LF9 engines), 1984(only available for LF9 engine)
-NB1 -- Emissions Systems: Closed Loop System -- 1982
-NB2 -- Emissions Systems: California Requirements
-NM4 -- Emissions Systems: Export, Canada
-NM5 -- Emissions Systems: Export, Canada, non-closed loop
-NM6 -- Emissions Systems: Export, Canada, recalibration
-NM8 -- Emissions Systems: Export, Canada, leaded fuel
-VJ9 -- Emissions Systems: California emissions information label -- 1978
-YA7 -- California emissions test -- 1978
-YF5 -- Emissions Systems: California Requirements -- 1978
-YF6 -- California procopt -- 1978

List of engine compartment emissions code labels VECI (Vehicle Emissions Control Information):
--Please let us know if you have an emissions label photo you can share that is not listed below or in the label list!
-For pictures and vacuum routing diagrams by label code, see here.
-Note that these codes will indicate the correct diagram to use for vacuum hose routing in each application.

-RPO code -- Emissions Label code -- Engine size and details -- GM label part #

1978 Emissions:
-NA2 -- CD -- 200 cubic inch 2bbl Chevrolet V6 -- 472881
-YF5 -- XK -- 231 cubic inch 2bbl Buick V6 (California) -- 476358
-NA2 -- CW -- 305 cubic inch 2bbl V8 -- 472882
-YF5 -- DN -- 305 cubic inch 2bbl V8 (California) -- 472885
-NA2 -- DT -- 350 cubic inch 4bbl V8 -- 472888
-NA6 -- LM -- 350 cubic inch 4bbl V8 (high altitude) -- 476338
-YF5 -- DZ -- 350 cubic inch 4bbl V8 (California) -- 472893

1979 Emissions:
-NA5 -- LC -- 200 cubic inch 2bbl Chevrolet V6 auto trans -- 14006774
-NA5 -- C4 -- 200 cubic inch 2bbl Chevrolet V6 manual trans -- 14010222
-YF5 -- BV -- 231 cubic inch 2bbl Buick V6 (California) -- 25505238
-NA5 -- Y7 -- 267 cubic inch 2bbl V8 -- 14017733
-NA5 -- X9 -- 305 cubic inch V8 4bbl -- 14015552
-YF5 -- CF -- 305 cubic inch 4bbl V8 (California) -- 14006783

1980 Emissions:
-NA5 -- AB -- 229 cubic inch 2bbl auto trans -- 14020621
-NA5 -- ZR -- 229 cubic inch 2bbl manual trans -- 14021871
-YF5 -- KP -- 231 cubic inch 2bbl (California) auto trans -- 25506764
-NA5 -- AK -- 267 cubic inch 2bbl -- 14020622
-NA5 -- ZS -- 305 cubic inch 4bbl manual trans -- 14021872
-NA5 -- AM -- 305 cubic inch 4bbl auto trans -- 14020623
-YF5 -- 26 -- 305 cubic inch 4bbl V8 (California) -- 14023197

1981 Emissions:
-NA5 -- AWS -- 229 cubic inch 2bbl Chevrolet V6 auto trans -- 14037722 or 14047073 or 14047077
-NA5 -- AWT -- 229 cubic inch 2bbl Chevrolet V6 manual trans -- 14037723 or 14047074
-YF5 -- BAB -- 231 cubic inch 2bbl Buick V6 (California) -- 25508923
-NM5 -- JTA -- 231 cubic inch 2bbl Buick V6 (Canada) -- 25508929
-NA5 -- ALJ -- 267 cubic inch 2bbl V8 -- 14031182
-NA5 -- ALM -- 305 cubic inch 4bbl V8 auto trans -- 14031184
-NA5 -- ALR -- 305 cubic inch 4bbl V8 manual trans -- 14031186
-YF5 -- ALU -- 305 cubic inch 4bbl V8 (California) -- 14031189

1982 Emissions:
-NA5 -- CJZ -- 229 cubic inch 2bbl Chevrolet V6 -- 14049982
-NA5 -- LAW -- 229 cubic inch 2bbl Chevrolet V6 -- 14063728
-NA5 -- LAX -- 229 cubic inch 2bbl Chevrolet V6 -- 14063729
-YF5 -- GAH -- 231 cubic inch 2bbl Buick V6 (California) -- 25512989
-NM4 -- NAA -- 231 cubic inch 2bbl Buick V6 (Canada) -- 25511249
-NM5 -- NAB -- 231 cubic inch 2bbl Buick V6 (Canada) -- 25513365
-NA5 -- CVH -- 267 cubic inch 2bbl V8 -- 14055193
-NA5 -- CLA -- 267 cubic inch 2bbl V8 -- 14048893
-NA5 -- LBN -- 267 cubic inch 2bbl V8 -- 14065520
-NM5 -- CCH -- 267 cubic inch 2bbl V8 -- 14044689
-NM5 -- LBF -- 267 cubic inch 2bbl V8 -- 14063743
-NA5 -- LBR -- 305 cubic inch 4bbl V8 -- 14065521
-NA5 -- LBS -- 305 cubic inch 4bbl V8 -- 14065522
-YF5 -- LAN -- 305 cubic inch 4bbl V8 (California) -- 14063721
-NM6 -- CCN -- 305 cubic inch 4bbl V8 (Canada) -- 14044693
-NA5 -- OYD -- 350 cubic inch fuel injection Diesel V8 -- 22517335
-Note: 350 Diesel emsissions label exists for all G bodies, not necessarily on El Caminos
-Note: GM part number 14048894 used on federal emissions 305 on 250 Dual Bed Beaded Converter

1983 Emissions:
-NA5 -- ??? -- 229 cubic inch 2bbl Chevrolet V6 --
-YF5 -- BBB -- 231 cubic inch 2bbl Buick V6 (California) -- 25514319
-NM4 -- JBA -- 231 cubic inch 2bbl Buick V6 (Canada) -- 25514320
-NA5 -- DYT -- 305 cubic inch 4bbl V8 -- 14071149
-NA5 -- DTN -- 305 cubic inch 4bbl V8 -- 14065565
-YF5 -- DTR -- 305 cubic inch 4bbl V8 (California) -- 14065566
-YF5 -- DYU -- 305 cubic inch 4bbl V8 (California) -- 14071150
-NM5 -- DCB -- 305 cubic inch 4bbl V8 (Canada) -- 14065507
-NM5 or NM8 -- DCD -- 305 cubic inch 4bbl V8 (Canada) -- 14065509
-NA5 or YF5 or NA6 -- SAY -- 350 cubic inch fuel injection Diesel V8 -- 22518536
-YF5 -- DXC -- With VJ9 (California) El Camino specific, probably Diesel -- 14063736

1984 Emissions:
-NA5 -- -- 229 cubic inch 2bbl Chevrolet V6
-NB2 -- NDM -- 231 cubic inch 2bbl Buick V6 (California) -- 25518312
-NM4 or NM8 -- NXL -- 231 cubic inch 2bbl Buick V6 (California) -- 25518314
-NA5 -- XJT -- 305 cubic inch 4bbl V8 -- 1407530
-NA5 -- XSF -- 305 cubic inch 4bbl V8 -- 1407579
-YF5 -- XSK -- 305 cubic inch 4bbl V8 (California)
-YF5 -- XJU -- 305 cubic inch 4bbl V8 (California)
-NA5 -- ??? -- 350 cubic inch fuel injection Diesel V8
-NA6 -- ??? -- 350 cubic inch fuel injection Diesel V8 (high altitude)
-YF5 -- DXC -- With VJ9 (California) El Camino specific, probably Diesel -- 14063736

1985 Emissions:
-NA5 -- UBC -- 262 cubic inch fuel injection (TBI) V6 -- 14086523
-NB2 -- ??? -- 262 cubic inch fuel injection (TBI) V6 (California)
-NB2 -- UBH -- 305 cubic inch 4bbl V8 (California) -- 14086526
-NA5 -- UNP -- 305 cubic inch 4bbl V8 -- 14086594

1986 Emissions:
-NA5 -- YKH -- 262 cubic inch fuel injection (TBI) V6 -- 14100955
-NB2 -- YKJ -- 262 cubic inch fuel injection (TBI) V6 (California) -- 14100956
-NA5 -- YCL -- 305 cubic inch 4bbl V8 -- 14100932
-NM8 -- YCT -- 305 cubic inch 4bbl V8 (Canada) -- 14100938
-NB2 -- YCP -- 305 cubic inch 4bbl V8 (California) -- 14100935
-NB2 -- YCY -- 305 cubic inch 4bbl V8 (California) -- 14100942
-NM5 -- ??? -- 305 cubic inch 4bbl V8 (Canada) -- 14086573

1987 Emissions:
-NA5 -- ZCP -- 262 cubic inch fuel injection (TBI) V6 -- 10051426
-NB2 -- ZCS -- 262 cubic inch fuel injection (TBI) V6 (California) -- 10051428
-NA5 -- ZDB -- 305 cubic inch 4bbl V8 -- 10051436
-NA5 -- ZCT -- 305 cubic inch 4bbl V8 -- 10051429
-NB2 -- ZCW -- 305 cubic inch 4bbl V8 (California) -- 10051431
-NB2 -- ZDD -- 305 cubic inch 4bbl V8 (California) -- 10051438
-NM5 -- ZCY -- 305 cubic inch 4bbl V8 (Canada) -- 10051433
-NM5 or NM8 -- ZDA -- 305 cubic inch 4bbl V8 (Canada) -- 10051435

-RPO -- description -- year notes
-199 -- Seat Belt, Black
-249 -- Seat Belt, Light Blue -- 1978
-24I -- Interior, Light Blue -- 1978
-24V -- Vinyl, Light Blue -- 1978
-24X -- Big 4, Light Blue
-27B -- CDD2 Blue Cloth Bucket -- 1985
-621 -- Interior, Camel
-629 -- Seat Belt, Camel
-62V -- Vinyl, Camel
-A01 -- Glass, Soft-Ray Tinted: all windows -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-A31 -- Windows, Power -- 1978, (1979 assumed), 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-A42 -- Seat, Power: Six-way -- 1978
-A51 -- Bucket Seats
-A52 -- Bench Seat -- 1980
-A65 -- Split Front Seat -- 1982
-AG9 -- Seat, Power: Six-way only with 50/50 seat -- 1979, 1980, 1981
-AK1 -- Belts, Deluxe: color-keyed seat and shoulder -- 1978, 1979
-AU3 -- Door Lock System, Power -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-BS1 -- Body Insulation 'Acoustic' Package -- 1980
-B32 -- Floor Covering: Mats, Color-keyed Floor (front only) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-D24 -- Container, Litter (passenger kick panel) -- 1978, 1979
-D34 -- Mirror: Visor Vanity -- 1978, 1979
-D55 -- Console (center console) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-D64 -- Mirror: Visor Vanity, Illuminated -- 1978, 1979
-N33 -- Steering Wheel: Comfortilt (tilt wheel) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-TR9 -- Lighting, Auxilliary (incl. headlamp buzzer T63, courtey and underhood lights) -- 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987
-UF7 -- Gage Package (incl. voltmeter, temperature, oil pressure guages and U35 clock) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
-U14 -- Instrumentation: Special (upgraded guage cluster, incl. Z53 guages, incl. U35 clock) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
-U16 -- Tachometer (available only with U39) -- 1986, 1987
-U35 -- Clock: Electric (in guage cluster) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
-U39 -- Gage Package with trip odometer (incl. voltmeter, temperature and oil pressure guages) -- 1986, 1987
-ZJ9 -- Lighting, Auxilliary -- 1978

These options usually included with other packages and not necessary noted on build sheets individually:
-C94 -- Dome/Courtesy Lamp - Electronic Delay Switch -- 1980
-T63 -- Headlight warning buzzer
-U26 -- Underhood lamp
-U27 -- Glove compartment light
-U28 -- Ash tray light
-U29 -- Instrument Panel Courtesy Lamp
-Z53 -- Tachometer, Voltmeter, Temperature, and Oil Pressure guages (incl. in U14)

Notes: The standard guage cluster for early years with linear speedometer is not listed as an RPO. The UF7 option would give round guages with clock, and U14 would give round guages with clock and tachometer. There is some confusion on which guage packages of which years included a trip odometer.

-RPO -- description -- years available
-B3W -- Preliminary price information -- 1985
-FRM -- Fremont Plant -- 1978
-V94 -- Export Tax
-W84 -- Add Fuel, Gas -- 1980
-YH6 -- Bonus value option package -- 1985
-Z49 -- Canada Package -- 1980

Note: we asssume that after 1980, power steering became standard.

-RPO -- description -- years available
-C60 -- Air Conditioning -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-CD4 -- Windshield Wiper Equipment: Intermittent System -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-J50 -- Vacuum Power Brakes -- 1979
-JM5 -- Power HD Brakes, Tandem Booster -- 1980, 1982
-K05 -- Block Heater, 600w, 120v -- 1983, 1984, 1985, 1986
-K30 -- Speed Control: Cruise-Master -- 1978, 1979, 1980
-K34 -- Speed Control, Electronic: with resume speed -- 1984, 1985, 1986
-K35 -- Speed Control With Resume Speed: Automatic -- 1981, 1982, 1983
-K76 -- Generator: 61 Amp Delcotron -- 1978
-K77 -- Alternator: 55 Amp -- 1980
-K81 -- Generator: 63 Amp Delcotron -- 1979, 1980, 1981
-N41 -- Steering: Power -- 1978, 1979, 1980
-NY8 -- Steering: Power #800 -- 1979
-TT4 -- Headlamps, Halogen -- 1981, 1985, 1986
-TT5 -- Headlamps, Halogen -- 1982, 1983, 1984
-U05 -- Horns, Dual -- 1980
-UA1 -- Battery: Heavy Duty -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-V01 -- Radiator, Heavy Duty -- 1978, 1979
-V08 -- Cooling, Heavy Duty -- 1980, (1981 assumed), 1982, 1983, 1984, 1985, 1986
-V10 -- Cold Climate Package (only on Diesel, incl. UA1 and K05) -- 1983

Note: we asssume that after 1980, power steering became standard.

-RPO -- description -- years available
-AV3 -- Tie-Downs, Cargo Box (inside the box) -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-BW2 -- Moldings: Body Side, Deluxe -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-BX8 -- Moldings: Front Fender, Body Side and Tailgate -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-B81 -- Moldings: No Body Side Moldings
-B93 -- Moldings: Door Edge Guard -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-B96 -- Moldings: Wheel Openings -- 1982
-D33 -- Mirror: Outside Rearview, LH Remote -- 1978, 1979, 1980, 1981, 1982, 1983
-D35 -- Mirrors: Sport, LH Remote and RH Manual -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-D60 -- Non Recommended Color Combination -- 1981
-D68 -- Mirrors: Sport, Twin Remote -- 1978, 1979, 1980, 1981
-D73 -- Rails, Cargo Box Side -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-VE5 -- Bumper Equipment: Bumper Rub Strips -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-V30 -- Bumper Equipment: Bumper and guards, front and rear -- 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986
-Y07 -- Side window molding
-VK3 -- Front License Plate Holder -- 1978
-YT9 -- FI/Body Parts -- 1978
-ZK9 -- Roof Cover, Conquista Vinyl -- 1978, 1979, 1980
-ZP2 -- Exterior/Interior override -- 1978
-11K -- Cover, Cargo Box Tonneau: White -- 1978, 1979, 1980, 1981, 1982
-19K -- Cover, Cargo Box Tonneau: Black -- 1978, 1979, 1980, 1981, 1982
-19Q -- Moldings: Black -- 1978, 1982
-22Q -- Moldings: Light Blue -- 1978
-44Q -- Moldings: Light Green -- 1978
-61Q -- Moldings: Light Camel -- 1978
-79Q -- Moldings: Dark Carmine -- 1978
-94A -- Stripe Gold

Accent colors: [Note that not all year availability may be correct for all colors]
-Note: The color code numbers below are generally similar for the L codes (Secondary Colors), and U (Primary Colors)
-11M -- Accent Color: White -- 1978, 1979, 1980, 1981, 1982, 1983
-12M -- Accent Color: Silver Metallic -- 1985, 1986, 1987
-15M -- Accent Color: Silver Metallic -- 1978, 1979, 1980, 1983, 1984, 1985(called Medium Gray Metallic), 1986(called Medium Gray Metallic), 1987(called Medium Gray Metallic)
-16M -- Accent Color: Gray Metallic -- 1978, 1981(called Siler Metallic), 1982(called Siler Metallic)
-17M -- Accent Color: Bright Silver Metallic -- 1984
-19M -- Accent Color: Black -- 1978, 1979, 1980, 1981, 1983, 1984, 1985, 1986, 1987
-21M -- Accent Color: Light Blue Metallic -- 1978, 1980, 1981, 1982
-22M -- Accent Color: Medium Blue Metallic -- 1978(called Light Blue Metallic), 1979(called Light Blue Metallic), 1981, 1983(called Light Blue Metallic), 1984(called Light Blue Metallic)
-25M -- Accent Color: Light Blue Metallic -- 1985, 1986, 1987
-27M -- Accent Color: Dark Blue Metallic -- 1983, 1984
-29M -- Accent Color: Dark Blue Metallic -- 1978, 1980, 1981, 1982
-31M -- Accent Color: Dark Blue Metallic -- 1985, 1986, 1987
-35M -- Accent Color: Cream -- 1981
-36M -- Accent Color: Champagne Metallic -- 1981
-42M -- Accent Color: Light Fern Metallic -- 1983, 1984
-43M -- Accent Color: Light Green Metallic -- 1985, 1986
-44M -- Accent Color: Dark Green Metallic -- 1978(called Light Green Metallic), 1979(called Medium Green Metallic), 1980
-45M -- Accent Color: Light Jade Metallic -- 1978(called Medium Green Metallic), 1981(called Light Jade Green Metallic), 1982
-46M -- Accent Color: Medium Green Metallic -- 1985
-47M -- Accent Color: Jade Green Metallic -- 1981
-48M -- Accent Color: Dark Fern Metallic -- 1983, 1984
-49M -- Accent Color: Dark Jade Metallic -- 1982
-50M -- Accent Color: Yellow -- 1980
-54M -- Accent Color: Yellow Beige -- 1979(called Light Yellow), 1986
-56M -- Accent Color: Gold Metallic -- 1978
-58M -- Accent Color: Light Brown Metallic -- 1985, 1986, 1987
-59M -- Accent Color: Cream Beige -- 1980(called Beige), 1983(called Beige), 1984(called Beige), 1985
-61M -- Accent Color: Beige -- 1978(called Light Camel), 1979
-62M -- Accent Color: Medium Brown Metallic -- 1983(called Light Brown Metallic), 1984(called Light Brown Metallic), 1985, 1986, 1987
-63M -- Accent Color: Beige -- 1978(called Camel Metallic), 1979(called Camel Metallic), 1980(called Light Camel Metallic), 1981, 1982
-67M -- Accent Color: Dark Brown Metallic -- 1978(called Saffron Metallic), 1979(called Saffron Metallic), 1983, 1984
-68M -- Accent Color: Light Brown Metallic -- 1981, 1982
-69M -- Accent Color: Medium Brown Metallic -- 1978(called Dark Camel Metallic), 1979(called Dark Brown Metallic), 1980(called Medium Camel Metallic), 1981
-71M -- Accent Color: Maroon Metallic -- 1987
-72M -- Accent Color: Light Maroon Metallic -- 1981, 1982(called Light Redwood Metallic)
-73M -- Accent Color: Light Maroon Metallic -- 1983, 1984
-75M -- Accent Color: Claret Metallic -- 1980
-76M -- Accent Color: Dark Claret Metallic -- 1980
-77M -- Accent Color: Carmine Metallic -- 1978, 1979, 1980(called Cinnabar), 1981(called Maroon Metallic), 1982(called Redwood Metallic)
-78M -- Accent Color: Dark Maroon Metallic -- 1983(called Maroon Metallic), 1984
-79M -- Accent Color: Dark Carmine Metallic -- 1978, 1979, 1985(called Dark Maroon Metallic), 1986(called Dark Maroon Metallic), 1987(called Dark Maroon Metallic)
-80M -- Accent Color: Silver Gray -- 1982
-84M -- Accent Color: Charcoal Metallic -- 1982
-85M -- Accent Color: Gray -- 1980

Note: After 1980 the vinyl roof options seems to have been no longer offered, although we have not yet encountered a production fifth generation El Camino with a vinyl roof. Vinyl roof color codes: CC=Light Camel Metallic, BB=Black, DD=Light Blue Metallic, RR=Dark Claret Metallic, GG=Dark Green Metallic, QQ=Gray, WW=White.

-RPO -- description -- years available
-6CX -- Front Spring LH
-7CX -- Front Spring RH
-6FC -- Front Spring LH -- 1978
-7FC -- Front Spring RH -- 1978
-8HK -- Rear Spring LH -- 1978
-9HK -- Rear Spring RH -- 1978
-F40 -- Suspension Equipment: Heavy duty front and rear -- 1978, (1979 assumed), 1980
-F41 -- Suspension Equipment: Sport -- 1978, 1979, 1980, 1981, 1982, 1983(not available on Diesel), 1984(not available on Diesel), 1985, 1986

Chassis:

1978 (2750 lb capacity all powertrain combinations, positraction rear available in all ratios):
-3-speed manual (200 V6), 2.73 rear axle ratio only, floor shift
-4-speed manual (305 V8, 350 V8), 2.73 rear axle ratio only, floor shift
-3-speed automatic (200 V6), 2.73 rear axle ratio only
-3-speed automatic (305 V8, 305 V8 California, 350 V8, 350 V8 California), 2.41 axle std., 2.73 optional
-3-speed automatic (231 V6 California), 2.73 rear axle ratio only

1979 (2750 lb capacity all powertrain combinations, positraction rear available in all ratios):
-3-speed manual (200 V6), 2.73 rear axle ratio only, floor shift
-4-speed manual (267 V8, 305 V8), 3.08 rear axle ratio only, floor shift
-3-speed automatic (200 V6), 2.73 rear axle ratio only
-3-speed automatic (267 V8), 2.56 rear axle ratio only
-3-speed automatic (305 V8, 305 V8 California, 350 V8), 2.41 axle std., 2.73 optional
-3-speed automatic (231 V6 California), 2.73 rear axle ratio only

1980 (2750 lb capacity all powertrain combinations, positraction rear available in all ratios only on non-California):
-3-speed manual (229 V6), 2.73 rear axle ratio only, floor shift, ratios: 3.5/1.89/1/Rev 3.62
-4-speed manual (305 V8), 3.08 rear axle ratio only, floor shift, ratios: 2.85/2.02/1.35/1/Rev 2.85
-3-speed automatic 200c (229 V6), 2.73 rear axle ratio only
-3-speed automatic th350 (267 V8), 2.56 rear axle ratio only
-3-speed automatic th250 OR 200c (305 V8), 2.41 axle std. [trans type dependent on production line choice]
-3-speed automatic th350 (305 V8), 2.73 optional axle
-3-speed automatic th350 (305 V8 California), 2.41 axle std., 2.73 optional
-3-speed automatic th350 (231 V6 California), 2.73 rear axle ratio only

1981 (2750 lb capacity all powertrain combinations, positraction rear available in all ratios EXCEPT where noted):
-3-speed manual (229 V6), 2.73 rear axle ratio only, floor shift
-4-speed manual (305 V8), 3.08 rear axle ratio only, floor shift, positraction NOT available
-3-speed automatic (229 V6), 2.73 rear axle ratio only
-3-speed automatic (267 V8), 2.56 rear axle ratio only
-3-speed automatic (305 V8, 305 V8 California), 2.41 axle std., 2.73 optional
-3-speed automatic (231 V6 California), 2.73 rear axle ratio only

1982: (2750 lb capacity all powertrain combinations, positraction rear available in all ratios):
-3-speed automatic (229 V6), 2.73 rear axle ratio only
-3-speed automatic (267 V8), 2.56 rear axle ratio only
-3-speed automatic (305 V8), 2.41 axle std., 2.73 optional
-3-speed automatic (231 V6 California), 2.73 rear axle ratio only

1983: (positraction rear available in all ratios):
-3-speed automatic (229 V6 NA5 emissions), 2.41 rear axle ratio only
-3-speed automatic (229 V6 NA6 emissions), 2.73 rear axle ratio only
-3-speed automatic (305 V8), 2.41 axle std., 3.08 optional
-3-speed automatic (350 V8 Diesel), 2.29 axle std,. 2.73 optional
-3-speed automatic (231 V6 California), 2.73 rear axle ratio only

1984: (positraction rear available in all ratios):
-3-speed automatic (229 V6), 2.41 axle std., 2.73 optional
-3-speed automatic (305 V8), 2.41 axle std., 3.08 optional
-3-speed automatic (350 V8 Diesel), 2.29 axle std,. 2.73 optional
-3-speed automatic (231 V6 California), 2.73 rear axle ratio only

1985: (positraction rear available in all ratios):
-3-speed automatic OR 4-speed automatic (262 V6), 2.41 axle std., 2.73 optional
-3-speed automatic OR 4-speed automatic (305 V8), 2.41 axle std., 2.73 optional

1986 and 1987: (positraction rear available in all ratios):
-3-speed automatic (262 V6), 2.41 axle std., 2.73 optional
-3-speed automatic (305 V8), 2.41 axle std., 2.73 optional
-4-speed automatic (262 V6), 2.56 axle std., 3.08 optional
-4-speed automatic (305 V8), 2.56 axle std., 3.08 optional

Trim levels Offered By Year:
1978:
-Classic, Conquista, Super Sport, Black Knight

1979:
-El Camino, Conquista, El Camino SS, Royal Knight

1980-1981:
-Standard El Camino, Conquista, Super Sport, Royal Knight

1982-1983:
-El Camino, Conquista, Super Sport, Royal Knight

1984-1987:
-El Camino, Conquista, SS Sport Decor

Trim Level Details:
El Camino/El Camino Classic/Classic/Standard El Camino:
-Base trim level, one color paint.

Conquista/El Camino Conquista/RPO D91:
-Up-level trim with two-tone paint and more chrome, specifically a shoulder-line of chrome dividing the upper/lower colors.

El Camino Super Sport/Super Sport/El Camino SS/SS Sport Decor/RPO Z15:
-Up-level trim with SS badging and rally wheels. RPO (Regular Production Option) Z15.

Choo-Choo Customs conversion:
-El Camino SS was dealer-offered as a conversion from mid-1983 to end of production, completed by Choo-Choo Customs Inc., of Chattanooga, Tennessee to include the aerodynamic front end similar to the Monte Carlo SS (although a different molding since the El Camino is slighly narrower in the front), as well as other cosmetic customizations. For more details see here.

Black Knight/RPO Z16:
-RPO (Regular Production Option) Z16, also requires SS Z15. Special edition inspired package with a code 19 black painted car and caramel interior and added gold hood decal displaying two dragons flanking a Knight facing head on. The fenders had Black Knight done in florid Olde English script and repeated on the tailgate. Sport mirrors, rally wheels, and a front air dam. Production of the 1978 Black Knight was low; about 1,200 cars were made. A bulliton to dealers from Truck Merchandising Manager L.P. Schinzing specifies that both the Z16 Super Sport package and the Z15 Black Knight package must be specified on orders. Solid black paint, tri-tone gold pin striping on sides and tailgate, "Black Knight" lettered decals on lower front fender and lower right hand portion of tailgate. All exterior SS designation is eliminated (EL Camino SS nameplate on instrument panel is retained). Black side window reveal moldings, and gold graphic decal on hood. Gold rally wheels. Options not available on Black Knight: Body side moldings (BW2), Conquista decor eqip (D91), Wire wheel trim covers (N95), Silver sport wheel covers (PB2).

Royal Knight/RPO Z16:
-RPO (Regular Production Option) Z16, also requires SS Z15. Continuation of the Black Knight package but renamed due to litigation issues. GM ran the Black Knight for only one year because a lawsuit was launched against them for using the name. Sources do not mention who launched the suit but Marvel Comics had a Black Knight character with that script from 1955 and kept it going afterwards. In 1979 and onward, Chevrolet issued the package as Royal Knight. The Royal Knight was essentially an add on to the El Camino SS trim so all Royal Knights are, in effect, SS cars as well. They have two RPO codes on the build sheet and sales document. RPO Z15 for the SS package and Z16 for the Royal Knight package. 1979 had 2,815 Royal Knights produced. This package was released in paint colors besides black. A print ad shows a Royal Knight depicted in metallic silver with red hood logo. Decal details: large hood decal (dragons on shield), "Royal Knight" fender decals, one each side, "Royal Knight" tailgate decal, upper and lower body side stripes including: front fender, door, rear quarter panel and tailgate.

1979 Royal Knight color options:
-Exterior -- Decal -- Interior
-Beige -- Gold -- Camel
-Black -- Gold -- Black or Camel
-Black -- Blue -- Blue
-Black -- Red -- Carmine
-Blue, dark metallic -- Blue -- Black or Blue
-Blue, light metallic -- Blue -- Black or Blue
-Brown, dark metallic -- Gold -- Camel
-Camel, metallic -- Gold -- Black or Camel
-Carmine, dark metallic -- Red -- Black or Carmine
-Carmine, dark metallic -- Gold -- Camel
-Carmine, metallic -- Red -- Black or Carmine
-Silver, metallic -- Red -- Black or Carmine
-White -- Red -- Black or Carmine
-White -- Blue -- Blue
-White -- Gold -- Camel

1979 Royal Knight print ads:

1980 Royal Knight color options:
-Exterior -- Decal -- Interior
-Black -- Gold -- Black or Camel
-Black -- Blue -- Blue
-Black -- Red -- Claret
-Blue, dark metallic -- Blue -- Blue
-Blue, light metallic -- Blue -- Black or Blue
-Camel, light metallic -- Gold -- Camel
-Camel, medium metallic -- Gold -- Camel
-Cinnabar -- Red -- Black or Camel
-Claret, metallic -- Red -- Camel
-Claret, dark metallic -- Red -- Claret
-Claret, dark metallic -- Gold -- Camel
-Silver, metallic -- Red -- Black or Claret
-White -- Red -- Black or Claret
-White -- Blue -- Blue
-White -- Gold -- Camel

1980 Royal Knight print ads:

1981 Royal Knight color options:
-Exterior -- Decal -- Interior
-Black -- Gold -- Camel
-Black -- Red -- Maroon
-Blue, dark metallic -- Blue -- Dark Blue
-Blue, light metallic -- Blue -- Dark Blue
-Brown, light metallic -- Gold -- Camel
-Brown, medium metallic -- Gold -- Camel
-Maroon, metallic -- Gold -- Camel
-Maroon, metallic -- Red -- Maroon
-Maroon, light metallic -- Red -- Maroon
-Maroon, light metallic -- Gold -- Camel
-Silver, metallic -- Blue -- Dark Blue
-Silver, metallic -- Red -- Maroon
-White -- Red -- Maroon
-White -- Blue -- Dark Blue
-White -- Gold -- Camel

1982 Royal Knight color options:
-Exterior -- Decal -- Interior
-Blue, dark metallic -- Blue -- Dark Blue
-Blue, light metallic -- Blue -- Dark Blue
-Brown, light metallic -- Gold -- Camel
-Redwood, metallic -- Gold -- Camel or Redwood
-Silver Gray -- Red -- Silver Gray
-Silver, metallic -- Blue -- Dark Blue
-Silver, metallic -- Red -- Silver Gray
-White -- Red -- Redwood
-White -- Blue -- Dark Blue
-White -- Gold -- Camel

GMC Caballero:
-Base package, similar to El Camino/Classic package.

GMC Amarillo/RPO D91:
-Similar to Conquista.

GMC Diablo/Diablo Decor/RPO YE7:
-Similar to both the Royal Knight package and SS package, GMC offered the Diablo package for the Caballero. This continued even after the Royal Knight package was discontinued, making it more akin to the SS package overall.

Choo-Choo Customs conversions (dealer docs show pics in 1986 catalog under "SS Sport trim"). It appears to have officially been called the "El Camino SS".

The following is from GM approved Choo Choo Customs print ad (ad when shown in most sources in black and white is not very readable, so we have translated it here in text):

"The Original El Camino SS was produced by Choo Choo Customs for GM from mid-1983 until the El Camino series was discontinued at the end of 1987.

In addition to the aerodynamic nose treatment that was the primary styling feature of all El Camino SS, all vehicles received graphics on the fascia, doors, and tailgate, and a small chrome train logo above the glove compartment door.

Vehicles manufactured in 1987 also have the Choo Choo Customs logo with train on the front fascia and tailgate. A limited number of El Camino SS had aerodynamic ground effect style side exhausts with rectangular chrome exits.

Early El Camino SS until mid-1985 used aluminum body side molding with machine-turned center and two vinyl inserts running full length of the molding. Later El Camino SS used a more rounded style body side molding. Some vehicles used factory side molding and fender well trim.

Many El Camino SS were equipped with aluminum wheels. Early vehicles had center caps with styling holes. Later vehicles featured solid center caps.

Aluminum cargo rails were also installed in numerous vehicles.In 1986, Chevrolet was the offical truck of the Indianapolis 500 and a specially developed El Camino SS was one of the featured vehicles that performed on-track services before and throughout the race. This one only El Camino SS featured an aluminum 350 CID Chevy engine and functioning strobe headlights and tail lights, plus a roll bar mounted strobe light system.

A special El Camino SS was the only truck to ever pace an IROC race, This IROC-S also featured the trademark aerodynamic front end design, IROC urethane paint in custom candy colors, and 16" aluminum wheels. Approximately fifteen IROC-S were built between '85 and '86.

The same high quality GM approved components that made the original El Camino SS unique are available for restoration, customizing, and crash replacement.

These components are now available for enthusiasts who want to create an El Camino SS of their own. All of the El Camino SS products in this catalog are made on original tooling to exacting specifications and ...

The nose assembly and other components fit all El Caminos '78 through '87 and the popular Chevrolet Malibu '78 through '83.

Let us show you how to make your "Heartbeat" a little faster with genuine El Camino SS componets only from Choo Choo Customs.

Choo Choo Customs, Specialty Parts Division, 7801 Lee Highway, Chattanooga, TN 37421, 1-615-899-4473"

IROC-S print ad:

IROC-S, #15:

Where is the VECI label (Vehicle Emissions Control Information)?

These are hard to come by in even a semi-readable form... thanks to all the sources that these pictures and photos come from.
--Please let us know if you have an emissions label photo you can share that is not listed below!

-For a reference of applications where each VECI (Vehicle Emissions Control Information) label applies, see here.

Documents for model differences:
     Chevrolet El Camino Model Charts
     Chevrolet El Camino Emissions Designations
     Chevrolet El Camino Powertrain Combinations
     Chevrolet El Camino Body Information

These brochures and sales dealer specifications are useful for determining model year details:
     1978 Chevrolet El Camino Sales Brochure
     1978 Chevrolet El Camino Dealer Information
     1978 GMC Caballero Dealer Information
     1978 Chevrolet El Camino Wiring Schematics
     1979 Chevrolet El Camino Dealer Information
     1980 Chevrolet El Camino Dealer Information
     1981 Chevrolet El Camino Dealer Information
     1982 Chevrolet El Camino Dealer Information
     1983 Chevrolet El Camino Dealer Information
     1984 Chevrolet El Camino Dealer Information
     1985 Chevrolet El Camino Dealer Information
     1986 Chevrolet El Camino Dealer Information
     1987 Chevrolet El Camino Dealer Information

Lock/Ignition Cylinder reference:

More print ads not shown on the rest of the page: