RPOARCHIVE
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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.

    Chevrolet · 1960-1982

    C/K Trucks

    c10 · c15 · c20 · c30 · k10 · k20 · k30 · c/k

    365 option rows 365 RPO codes 21 model years
    26% Factory-verified
    • ✓ Factory-verified · 96
    • ● Confirmed · 202
    • ◑ Single-source · 58
    • ⚠ Disputed · 9
    1967–72 Chevrolet C10 fleetside pickup

    Applicable options

    Documented RPO codes

    Have a VIN? Decode it at DecodeThis
    Model year
    Code Option Years Notes & factory source Confidence
    431 Custom Equipment (chrome grille & hub caps, custom trim) 1960
    CK10/20, C30/40
    GM Heritage factory kit — 1960 Chevrolet Truck, p.106.
    		Factory-verified
    680 Limited-Slip (Positraction) rear axle 1960
    C14/C15 light
    GM Heritage factory kit — 1960 Chevrolet Truck, p.8.
    		Factory-verified
    215 Optional rear axle ratio 1960
    With 371 axle
    GM Heritage factory kit — 1960 Chevrolet Truck, p.8.
    		Factory-verified
    219 Heavy-duty front suspension 1960
    GM Heritage factory kit — 1960 Chevrolet Truck, p.26.
    		Factory-verified
    329 Torsion-bar front suspension equipment 1960
    1960–62 IFS torsion bars
    GM Heritage factory kit — 1960 Chevrolet Truck, p.25.
    		Factory-verified
    212 Brake booster (vacuum) equipment 1960
    GM Heritage factory kit — 1960 Chevrolet Truck, p.25.
    		Factory-verified
    233 Heavy-duty frame reinforcements 1960
    GM Heritage factory kit — 1960 Chevrolet Truck, p.26.
    		Factory-verified
    254 Rear springs (heavy/auxiliary) 1960
    GM Heritage factory kit — 1960 Chevrolet Truck, p.25.
    		Factory-verified
    404 Heavy-duty rear axle equipment 1960
    GM Heritage factory kit — 1960 Chevrolet Truck, p.25.
    		Factory-verified
    457 Heavy-duty rear axle 1960
    Bundled w/ HD rear springs + Midland vacuum brake
    GM Heritage factory kit — 1960 Chevrolet Truck, p.26.
    		Factory-verified
    603 Heavy-duty rear springs 1960
    GM Heritage factory kit — 1960 Chevrolet Truck, p.26.
    		Factory-verified
    Z60 Custom Equipment (combined comfort + appearance) 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    Z61 Custom Appearance Option (bright grille/bezels/moldings) 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    GM Heritage factory kit — 1967 Chevrolet Truck, p.21.
    		Factory-verified
    Z62 Custom Comfort Option (armrests, sunshade, foam seat, insulation) 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    V37 Custom Chrome Option (chrome front & rear bumpers, hub caps) 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    V31 Front bumper guard 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    V35 Wraparound front bumper 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    V38 Painted rear bumper 1965–67
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1967 Chevrolet Truck, p.21.
    		Factory-verified
    V43 Rear step bumper 1965–66
    Pickups
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    B98 Side trim molding 1964–66
    Fleetside pickups
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    P01 Wheel covers 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    P02 Simulated-wire wheel covers 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    P03 Chrome hub caps 1966–67
    GM Heritage factory kit — 1967 Chevrolet Truck, p.21.
    		Factory-verified
    A55 Level-Ride (Bostrom) seat 1964–66
    Driver / driver+2-man
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    A57 Supplementary (auxiliary) seat 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    Z52 Full-depth foam seat 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    A09 Soft-Ray tinted glass, windshield only 1963–66
    Factory windshield-tint code (not A02)
    GM Heritage factory kit — 1963 Chevrolet Truck, p.6.
    GM Heritage factory kit — 1965 Chevrolet Truck, p.8.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    A11 Soft-Ray tinted glass, all windows 1966
    Factory all-windows-tint code (not A01)
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    A10 Full-View (large) rear window 1966
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    A02 Tinted glass, windshield only 1963–66
    Disputed: factory 1963–66 windshield tint was **A09** (see above); A02 is the later-era code
    		 Disputed
    A01 Soft-Ray tinted glass, all windows 1963–66
    Disputed: factory 1963–66 all-windows tint was **A11** (see above); A01 is the later-era code
    		 Disputed
    L21 194 cid I6 1965
    Base six, lightest models
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    L26 230 cid I6 1963–66
    Base engine, 1/2–3/4 ton
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    L25 292 cid I6 1963–66
    Optional big six
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    L32 283 cid V8 1965–66
    Base/optional V8 (kit resolves: truck 283 = L32, not L39)
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    L30 327 cid V8 1965–66
    Optional V8 (CE10) — factory kit resolves L30 = 327, not L32
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1967 Chevrolet Truck, p.21.
    		Factory-verified
    M01 Heavy-duty clutch 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    M10 Overdrive transmission 1963–66
    1/2-ton
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    M16 Warner T89B 3-speed manual (HD) 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    M20 Chevrolet 4-speed manual 1963–66
    GM Heritage factory kit — 1963 Chevrolet Truck, p.6.
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    M24 New Process 435 HD 4-speed manual 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    M35 Powerglide 2-speed automatic 1963–66
    C10–C30
    GM Heritage factory kit — 1964 Chevrolet Truck, p.16.
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    M45 Powermatic automatic 1965
    Heavier models
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    G80 Positraction rear axle 1964–66
    All light trucks (1963 GVW selector shows G81 — likely OCR/early variant)
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1967 Chevrolet Truck, p.21.
    		Factory-verified
    G86 No-Spin rear axle 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    G50 Heavy-duty rear springs 1964–66
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    G60 Auxiliary rear springs 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    H01 3.07 rear axle ratio 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    H04 4.11 rear axle ratio 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    H05 3.73 rear axle ratio 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    F49 Heavy-duty front axle 1964–66
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    F51 Heavy-duty shock absorbers 1963–66
    GM Heritage factory kit — 1963 Chevrolet Truck, p.6.
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    F59 Front stabilizer equipment 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    F60 Heavy front springs 1964
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    		Factory-verified
    F76 Front wheel locking hubs 1964–66
    K-series
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    J50 Vacuum power brakes 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    J70 Vacuum power brakes (hydraulic booster) 1964–66
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    C60 Air conditioning (All-Weather / Four-Season) 1966–67
    Not on cowl models
    GM Heritage factory kit — 1966 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1967 Chevrolet Truck, p.21.
    		Factory-verified
    C41 Thrift-Air (economy) heater & defroster 1964–66
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    C42 De Luxe Air heater & defroster 1964–66
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K24 Closed engine positive ventilation (PCV) 1963–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K19 Air Injection Reactor (A.I.R.) emissions 1966
    California; new for 1966
    GM Heritage factory kit — 1966 Chevrolet Truck, p.8.
    		Factory-verified
    K28 Fuel filter equipment 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K37 Engine governor 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    K46 Heavy-duty air cleaner 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K48 Oil-bath air cleaner 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    K66 Transistorized ignition system 1965
    New for 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    K67 Heavy-duty starter motor 1965–66
    Includes HD battery
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K76 61-amp Delcotron 1966
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K77 55-amp Delcotron 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    K79 42-amp Delcotron 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K81 62-amp Delcotron 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    K05 (KO5) Engine block heater 1963–66
    All (retained from RPO reference; not seen in kits)
    		 Single-source
    N01 Fuel tank, 21-gal 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    N02 Fuel tank, 30-gal 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    N33 Sports-Styled steering wheel 1963–66
    Factory kit resolves: N33 = Sports-Styled wheel (not Comfortilt) in these years; reused for Comfortilt from 1967
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    N34 Comfortilt steering wheel 1965
    The actual 1963–66 Comfortilt code
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    N40 Power steering 1963–66
    GM Heritage factory kit — 1964 Chevrolet Truck, p.16.
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    P10 Spare wheel carrier, under-frame 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    		Factory-verified
    P13 Spare wheel carrier, side-mounted 1965–66
    Pickups
    GM Heritage factory kit — 1965 Chevrolet Truck, p.19.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    A97 Spare wheel (side carrier) lock 1966
    Pickups (1965 used P19 for spare-wheel lock)
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    T60 Heavy-duty battery 1963–66
    70 amp-hr
    GM Heritage factory kit — 1964 Chevrolet Truck, p.16.
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    U16 Tachometer 1963–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    U60 Radio, manual control 1963–66
    GM Heritage factory kit — 1963 Chevrolet Truck, p.6.
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    U63 Push-button AM radio 1963–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    U69 AM/FM push-button radio 1963–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    U86 Trailer jumper cable equipment 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    V01 Heavy-duty radiator 1963–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    V04 Radiator shutters 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    V05 Heavy-duty cooling equipment 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    V62 Jack 1965
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    		Factory-verified
    V74 Hazard flasher switch 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    V75 Hazard & marker lamps 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    V76 Front towing hooks 1965–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    Z53 Ammeter, oil pressure & temperature gauges 1963–66
    GM Heritage factory kit — 1965 Chevrolet Truck, p.20.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    Z55 Special serial-number (VIN) plate 1963–66
    Export/special (kit Z-series pp.20 are mostly GVW-rating plates; Z55 line garbled)
    		 Single-source
    D29 West Coast Jr mirror (6×11) 1964–66
    GM Heritage factory kit — 1964 Chevrolet Truck, p.15.
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    D30 West Coast Sr mirror (7×16) 1966
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    D32 Exterior rearview mirror (swing/fixed arm) 1966
    Pickups
    GM Heritage factory kit — 1966 Chevrolet Truck, p.24.
    		Factory-verified
    Z61 Custom Appearance package 1967–72
    Exterior brightwork; modern lists reuse Z61 for trailer provisions
    GM Heritage factory kit — 1967 Chevrolet Truck, p.21.
    		Factory-verified
    Z62 Custom Comfort & Convenience package 1967–72
    With Z61 = "Custom Deluxe"; lineage continues as 1973+ decor level 1
    		 Confirmed
    Z84 Custom Sport Truck (CST); Cheyenne from 1971 1967–72
    Top trim; buckets/console available
    		 Confirmed
    YE9 Cheyenne Super 1971–72
    Top trim above Cheyenne
    		 Confirmed
    Z81 Camper Special equipment 1967–72
    3/4- and 1-ton; camper nameplate
    		 Confirmed
    Z17 Sierra Grande (GMC trim) 1967–72
    GMC only — see gmc/README
    		 Single-source
    YG8 Special promotional package (Bonanza-type year-end group) 1967–72
    Lineage: "Bonanza/Royal Sierra Package" in GM lists
    		 Confirmed
    BYP Sport equipment sales package 1967–72
    —
    		 Single-source
    ZJ9 Auxiliary lighting group 1967–72
    —
    		 Single-source
    YF5 California vehicle emissions registration 1967–72
    —
    		 Confirmed
    CB8 Removable top (hardtop) 1969–72
    K5 Blazer; open body was standard
    		 Confirmed
    Z58 Auxiliary removable top, white 1969–72
    K5 Blazer
    		 Confirmed
    Z59 Removable top, black 1969–72
    K5 Blazer
    		 Confirmed
    E55 End gate (tailgate in place of panel doors) 1967–72
    Suburban/panel rear opening choice
    		 Confirmed
    AS3 Rear seat 1967–72
    Suburban, Blazer; code reused 1973+ for crew-cab equipment
    		 Confirmed
    A53 Rear seat 1967–72
    Listed as "front bench" in car lists — meaning differs by line
    		 Disputed
    A80 Center & rear seats 1967–72
    Suburban 3-seat
    		 Single-source
    C69 Roof-mount / rear auxiliary air conditioning 1967–72
    Suburban, panel
    		 Single-source
    L26 230 cid I6 1967–70
    Base 1/2-ton
    		 Confirmed
    L22 250 cid I6 1967–72
    Base six from 1970-ish, optional earlier
    		 Confirmed
    L25 292 cid I6 1967–72
    Optional big six
    		 Confirmed
    L30 327 cid V8 1967–68
    Optional V8 (283/307 base)
    		 Confirmed
    LS9 350 cid V8 1969–72
    Replaced 327
    		 Confirmed
    L98 350 cid V8 4-bbl ~1971–72
    —
    		 Single-source
    L47 396/402 cid V8 ("400") 1970?–72
    Light-truck big block; sources vague on years
    		 Single-source
    L66 396/400 cid V8, 2-bbl 1970?–72
    —
    		 Single-source
    M01 Heavy-duty clutch 1967–72
    —
    		 Single-source
    M16 Heavy-duty 3-speed manual 1967–72
    Code reused later for other units
    		 Single-source
    M20 4-speed manual 1967–72
    SM465 in trucks (car lists say Muncie)
    		 Confirmed
    M24 HD 4-speed manual (New Process) 1967–72
    Car/modern lists show Borg-Warner — reuse
    		 Single-source
    M35 Powerglide 2-speed automatic 1967–72
    Through ~1972 in light trucks
    		 Confirmed
    M38 Turbo Hydra-Matic 350 3-speed automatic 1969–72
    —
    		 Confirmed
    M49 Turbo Hydra-Matic (TH400 per 67–72 list; TH350 per 73–87 list) 1967–72
    Meaning shifts across generations
    		 Disputed
    M10 Overdrive 1967–early 70s
    1/2-ton
    		 Confirmed
    G80 Positraction rear axle 1967–72
    —
    		 Confirmed
    G86 No-Spin / limited-slip rear axle 1967–72
    Detroit "No-Spin" locker
    		 Confirmed
    G87 Power-Lok / maximum-traction rear axle 1967–72
    Modern lists reuse G87 for 8.5" ring gear
    		 Single-source
    G94 3.31 rear axle ratio 1967–72
    —
    		 Single-source
    H01 3.07 rear axle ratio 1967–72
    —
    		 Single-source
    H05 3.73 rear axle ratio 1967–72
    —
    		 Single-source
    HB8 / H04 4.10 / 4.11 rear axle ratio 1967–72
    —
    		 Single-source
    JA1 4.10 rear axle ratio 1967–72
    —
    		 Single-source
    JA2 3.73 rear axle ratio 1967–72
    —
    		 Single-source
    J05 4.56 rear axle ratio (Dana) 1967–72
    K-series
    		 Single-source
    F51 HD front & rear shock absorbers 1967–72
    —
    		 Confirmed
    F59 Front stabilizer bar 1967–72
    —
    		 Confirmed
    F60 HD front springs 1967–72
    —
    		 Confirmed
    G50 HD rear springs 1967–72
    —
    		 Confirmed
    G60 Auxiliary rear springs 1967–72
    3/4-, 1-ton
    		 Confirmed
    G70 Rear leaf-spring suspension 1967–72
    C10 (in place of coils)
    		 Single-source
    F76 Front wheel locking hubs 1967–72
    K-series
    		 Confirmed
    J62 Front disc brakes 1967–70
    Standard from 1971
    		 Single-source
    J70 Vacuum power brake booster 1967–72
    —
    		 Confirmed
    JL4 Dual brake system (gas models) 1967
    Dual master cylinder, std later
    		 Single-source
    K05 Engine block heater 1967–72
    —
    		 Confirmed
    K19 Air Injection Reactor 1967–72
    California
    		 Confirmed
    K24 Closed engine positive ventilation 1967–72
    —
    		 Confirmed
    K30 Speed & cruise control 1967–72
    —
    		 Confirmed
    K66 Transistorized ignition 1967–72
    —
    		 Confirmed
    K76 61-amp Delcotron alternator 1967–72
    —
    		 Single-source
    K79 42-amp Delcotron alternator 1967–72
    —
    		 Confirmed
    K81 62-amp Delcotron (67–72 list) / 66-amp (73–87 & GM lists) 1967–72
    Amperage disagrees between sources
    		 Disputed
    T60 Heavy-duty battery 1967–72
    —
    		 Confirmed
    TP2 Auxiliary battery 1967–72
    Camper use
    		 Confirmed
    V01 Heavy-duty radiator 1967–72
    —
    		 Confirmed
    V05 Heavy-duty cooling 1967–72
    —
    		 Confirmed
    V48 Maximum anti-freeze protection 1967–72
    —
    		 Confirmed
    N02 30-gal fuel tank 1967–72
    —
    		 Single-source
    N05 Locking fuel cap 1967–72
    —
    		 Confirmed
    N18 Auxiliary fuel tank 1967–72
    —
    		 Single-source
    N33 Comfortilt steering wheel 1967–72
    —
    		 Confirmed
    N40 Power steering 1967–72
    —
    		 Confirmed
    V76 Front tow hooks 1967–72
    —
    		 Confirmed
    A02 Tinted windshield 1967–72
    —
    		 Confirmed
    A03 Tinted side windows 1967–72
    —
    		 Single-source
    A11 Tinted glass, all windows 1967–72
    —
    		 Single-source
    A28 Sliding rear window 1967–72
    —
    		 Confirmed
    A47 Custom Deluxe seat belts 1967–72
    —
    		 Confirmed
    A50 Bucket seats 1967–72
    CST/Cheyenne
    		 Confirmed
    A52 Custom bench seat 1967–72
    —
    		 Confirmed
    A57 Auxiliary 1-passenger seat 1967–72
    —
    		 Confirmed
    A97 Spare wheel lock 1967–72
    —
    		 Single-source
    B30 Floor carpeting 1967–72
    —
    		 Confirmed
    B80 Roof drip moldings 1967–72
    —
    		 Confirmed
    B85 Upper body side (belt reveal) molding 1967–72
    —
    		 Confirmed
    B93 Door edge guards 1967–72
    —
    		 Confirmed
    BX1 Body side molding, belt 1967–72
    Modern lists reuse for front-end ornamentation
    		 Single-source
    BX2 Body side molding, wide lower 1967–72
    —
    		 Single-source
    C42 Deluxe fresh-air heater 1967–72
    —
    		 Confirmed
    C60 Four-Season air conditioning 1967–72
    —
    		 Confirmed
    CA6 Roof ventilator 1967–72
    —
    		 Single-source
    D29 Junior West Coast mirrors 6×11, LH & RH 1967–72
    —
    		 Single-source
    D30 Senior West Coast mirrors 7×16, LH & RH 1967–72
    —
    		 Single-source
    DF1 Camper mirrors, painted 1967–72
    —
    		 Single-source
    DF2 Camper mirrors, stainless 1967–72
    —
    		 Confirmed
    DG4 Below-eye-level / West Coast Jr mirrors 1967–72
    —
    		 Confirmed
    DG5 West Coast 7×16 mirrors, both sides 1967–72
    —
    		 Confirmed
    D89 Body paint stripe (67–72 list); "special decor two-tone paint" in GM lists 1967–72
    —
    		 Disputed
    E81 Pickup box wood floor 1967–72
    Fleetside
    		 Confirmed
    P01 Full wheel covers 1967–72
    —
    		 Confirmed
    P03 Chrome hubcaps 1967–72
    —
    		 Confirmed
    P13 Side-mounted spare wheel carrier 1967–72
    —
    		 Confirmed
    U01 Roof marker/clearance lamps 1967–72
    —
    		 Confirmed
    U08 Dual horns 1967–72
    —
    		 Single-source
    U15 Speed warning indicator 1967–72
    —
    		 Confirmed
    U16 Tachometer 1967–72
    —
    		 Confirmed
    U29 Courtesy lamps 1967–72
    —
    		 Single-source
    U60 Manual (non-pushbutton) radio 1967–72
    —
    		 Single-source
    U63 Push-button AM radio 1967–72
    —
    		 Confirmed
    U69 AM/FM push-button radio 1971–72
    —
    		 Confirmed
    UB3 Side marker lamps 1968–72
    Modern lists reuse UB3 for gauge cluster
    		 Single-source
    UF2 Cargo area lamp 1967–72
    —
    		 Confirmed
    UY1 Camper wiring harness 1967–72
    —
    		 Confirmed
    V37 Chrome front & rear bumpers 1967–72
    —
    		 Confirmed
    V38 Painted rear bumper 1967–72
    —
    		 Confirmed
    V43 Painted rear step bumper 1967–72
    —
    		 Confirmed
    V46 Chrome front bumper 1967–72
    —
    		 Confirmed
    VF1 Chrome rear bumper 1967–72
    —
    		 Confirmed
    VF2 Chrome rear step bumper 1967–72
    —
    		 Single-source
    VK2 Tool & stowage box 1967–72
    —
    		 Single-source
    Z52 Full-foam bench seat 1967–72
    Modern lists reuse Z52
    		 Single-source
    Z53 Ammeter/oil/temperature gauges 1967–72
    —
    		 Confirmed
    Z62 Trim level 1 above base: Custom Deluxe (73–74), Scottsdale (75–82) 1973–82
    GMC: Super Custom → Sierra Grande → High Sierra
    		 Confirmed
    Z84 Trim level 2: Cheyenne 1973–81
    GMC: Sierra → High Sierra; dropped after 1981
    		 Confirmed
    YE9 Top trim: Cheyenne Super (73–74), Silverado (75–82) 1973–82
    GMC: Sierra Grande → Sierra Classic
    		 Confirmed
    Z77 Chevy Sport package (GMC Street Coupe) 1976–81
    Shortbed 1/2-ton; graphics, N67 rally wheels, V22, BC2
    		 Confirmed
    YG8 Bonanza package (GMC Royal Sierra) 1970s–82
    Year-end value package
    		 Confirmed
    YH7 Bonus Value option package 1973–82
    —
    		 Single-source
    Z81 Camper Special equipment, heavy duty 1973–82
    3/4-, 1-ton
    		 Confirmed
    Z76 Special commercial chassis (camper) equipment 1973–82
    —
    		 Confirmed
    ZQ2 Operating convenience group (power windows + locks) 1977–82
    —
    		 Confirmed
    V10 Cold climate package 1973–82
    —
    		 Confirmed
    YF5 California emissions certification 1973–82
    —
    		 Confirmed
    NA5 Federal emission system 1973–82
    —
    		 Confirmed
    NA6 High-altitude emission system 1973–82
    —
    		 Confirmed
    B3J Diesel equipment 1978–82
    With LF9/LH6/LL4 diesels
    		 Confirmed
    LD4 250 cid I6 (250Q) 1973–75
    Base
    		 Confirmed
    LE3 250 cid I6 (250D) 1976–82
    Base (integrated-head 250 from '78)
    		 Confirmed
    L25 292 cid I6 (292T) 1973–82
    3/4-, 1-ton and HD 1/2
    		 Confirmed
    LG8 307 cid V8 (307X) 1973
    Last year of 307
    		 Single-source
    LE9 305 cid V8 (305H) 4-bbl, federal 1981–82
    —
    		 Confirmed
    LF3 305 cid V8, California 1981–82
    —
    		 Confirmed
    LG9 305 cid V8 (305G) 2-bbl 1981
    —
    		 Single-source
    LS9 350 cid V8 (350L) 4-bbl 1973–82
    Volume V8
    		 Confirmed
    LT9 350 cid V8 (350M) HD (C6P) 1981–82
    HD-emissions 350
    		 Confirmed
    LF5 350 cid V8 (350P) 1970s
    HD application
    		 Single-source
    LE8 454 cid V8 1973–82
    C20/C30 (2WD)
    		 Confirmed
    LF9 350 cid V8 diesel (Oldsmobile 350N) 1978–81
    C10, Blazer, Suburban
    		 Confirmed
    LH6 379 cid (6.2L) V8 diesel, light duty 1982
    —
    		 Confirmed
    LL4 379 cid (6.2L) V8 diesel, heavy duty 1982
    —
    		 Confirmed
    ZW4 3-speed manual 1973–80
    Modern lists reuse ZW4 (glass pkg)
    		 Single-source
    M15 3-speed manual 1981–82
    Modern lists reuse M15
    		 Single-source
    MM3 3-speed manual c. 1982
    Modern lists reuse MM3
    		 Single-source
    M20 4-speed manual (SM465; listed "Muncie") 1973–82
    —
    		 Confirmed
    MM7 4-speed manual w/ overdrive 1982
    —
    		 Confirmed
    M49 THM350 3-speed automatic 1973–81
    Same code = TH400 in 67–72 list
    		 Disputed
    M38 THM350 3-speed automatic 1970s
    —
    		 Confirmed
    MV4 THM350C (lock-up) 3-speed automatic c. 1981–82
    —
    		 Confirmed
    M40 THM400 3-speed automatic 1977–82 (listed)
    TH400 also offered pre-77 under earlier coding
    		 Confirmed
    MX1 3-speed automatic (merchandising) 1970s–82
    —
    		 Single-source
    MD8 THM700R4 4-speed overdrive automatic 1982
    —
    		 Confirmed
    MX0 4-speed OD automatic (merchandising option for MD8) 1982
    —
    		 Confirmed
    GQ1 Standard (open) rear axle ratio 1973–82
    —
    		 Confirmed
    GU2 2.73 rear axle 1973–82
    —
    		 Confirmed
    HC2 2.76 rear axle 1973–82
    —
    		 Single-source
    HE3 3.07 rear axle 1973–82
    —
    		 Confirmed
    GU4 3.08 rear axle 1973–82
    —
    		 Confirmed
    GU6 3.42 rear axle 1973–82
    —
    		 Confirmed
    GT4 3.73 rear axle 1973–82
    —
    		 Confirmed
    GT5 4.10 rear axle 1973–82
    —
    		 Confirmed
    HC4 4.56 rear axle 1973–82
    —
    		 Confirmed
    G80 Locking rear differential (Eaton auto-locker in later years) 1973–82
    —
    		 Confirmed
    C5M GVW rating 6,100 lb 1973–82
    1/2-ton
    		 Confirmed
    C6P HD chassis / 8,600 lb GVW rating 1973–82
    "Big 10"/HD 3/4-ton emissions class
    		 Confirmed
    YA8 3,250 lb front axle 1973–82
    —
    		 Single-source
    F51 HD shock absorbers 1973–82
    —
    		 Confirmed
    F58 HD front stabilizer bar 1973–82
    —
    		 Confirmed
    F59 Front stabilizer bar 1973–82
    —
    		 Confirmed
    F60 HD front springs 1973–82
    —
    		 Confirmed
    G50 HD rear suspension 1973–82
    —
    		 Confirmed
    G51 Extra-capacity rear suspension 1973–82
    —
    		 Confirmed
    G60 Main & auxiliary rear springs 1973–82
    —
    		 Confirmed
    Z75 Front quad shock absorbers 1973–82
    K-series; modern lists reuse Z75
    		 Single-source
    NY1 Fuel tank shield / skid plate 1973–82
    K-series
    		 Confirmed
    NY7 Transfer case shield 1973–82
    K-series
    		 Confirmed
    NL2 Auxiliary fuel tank 1973–82
    —
    		 Confirmed
    JB5 Power disc/drum brake system 1973–82
    Std config on light trucks
    		 Confirmed
    J50 Vacuum power brakes 1973–82
    —
    		 Confirmed
    J55 HD power brakes 1973–82
    —
    		 Confirmed
    V01 HD radiator 1973–82
    —
    		 Confirmed
    V02 HD radiator w/ transmission oil cooler 1973–82
    —
    		 Confirmed
    KC4 Engine oil cooler 1973–82
    —
    		 Confirmed
    K05 (KO5) Engine block heater 1973–82
    —
    		 Confirmed
    K46 Air cleaner pre-cleaner 1973–82
    —
    		 Confirmed
    K81 66-amp generator (Delcotron) 1973–82
    —
    		 Confirmed
    UA1 HD battery 1973–82
    —
    		 Confirmed
    TP2 Auxiliary battery 1973–82
    Camper
    		 Confirmed
    K34 Cruise control 1973–82
    —
    		 Confirmed
    N33 Comfortilt steering wheel 1973–82
    —
    		 Confirmed
    N41 Power steering, variable ratio 1973–82
    —
    		 Confirmed
    N51 Power steering delete 1973–82
    Credit option
    		 Confirmed
    V76 Towing device / front tow hooks 1973–82
    —
    		 Confirmed
    D3E / E5Z / E7B / E9Z Speedometer drive-gear service codes 1973–82
    Axle/tire matching, not customer options
    		 Single-source
    CMD Assembly plant code — Flint, MI (label code, not an option) 1973–82
    Appears on option labels
    		 Single-source
    E62 Stepside pickup box 1973–82
    —
    		 Confirmed
    E63 Fleetside pickup box 1973–82
    —
    		 Confirmed
    E81 Wood floor, Fleetside box 1973–82
    —
    		 Confirmed
    B7N Pickup box panels, non-prime 1973–82
    Fleet
    		 Single-source
    AS3 Crew cab equipment (73–87 list); "rear seat, Suburban/utility" in GM lists 1973–82
    Reused code — see 67–72
    		 Disputed
    A01 Tinted glass, all windows 1973–82
    —
    		 Confirmed
    A28 Sliding rear window 1973–82
    —
    		 Confirmed
    A31 Power windows 1977–82
    —
    		 Confirmed
    AU3 Power door locks 1977–82
    —
    		 Confirmed
    A52 Front bench seat 1973–82
    —
    		 Confirmed
    B32 Color-keyed front floor mats 1973–82
    —
    		 Confirmed
    B54 Cab back panel insulation (73–87 list); "rear floor mats" in GM lists 1973–82
    Reused/conflicting
    		 Disputed
    B84 Black body side moldings (Fleetside) 1973–82
    —
    		 Confirmed
    B85 Bright body side / belt moldings 1973–82
    —
    		 Confirmed
    B93 Door edge guards 1973–82
    —
    		 Confirmed
    B96 Wheel opening moldings (bright) 1973–82
    —
    		 Confirmed
    YG1 Custom molding package 1973–82
    —
    		 Confirmed
    YG3 Deluxe molding package 1973–82
    —
    		 Confirmed
    D73 Pickup box side rails 1973–82
    —
    		 Confirmed
    CD4 Intermittent (pulse) windshield wipers 1970s–82
    —
    		 Confirmed
    C42 HD (deluxe outside-air) heater 1973–82
    —
    		 Confirmed
    C60 Air conditioning, front manual 1973–82
    —
    		 Confirmed
    C91 Dome/courtesy roof lamp 1973–82
    —
    		 Confirmed
    DF2 Camper-style stainless mirrors 1973–82
    —
    		 Confirmed
    DG4 Extended below-eye-line mirrors 1973–82
    —
    		 Confirmed
    DG5 Senior West Coast painted mirrors 1973–82
    —
    		 Confirmed
    D44 Painted below-eye-line mirrors 1973–82
    —
    		 Confirmed
    D45 Stainless below-eye-line mirrors 1973–82
    —
    		 Confirmed
    V22 Deluxe front appearance (chrome grille) 1973–82
    Std w/ YE9 from 1980
    		 Confirmed
    V31 Chrome front bumper guards 1973–82
    —
    		 Confirmed
    V37 Chrome front bumper (73–87 list); front+rear in GM lists 1973–82
    —
    		 Confirmed
    V42 Chrome rear step bumper 1973–82
    —
    		 Confirmed
    V43 Painted rear step bumper 1973–82
    —
    		 Confirmed
    VF1 Chrome rear bumper 1973–82
    —
    		 Confirmed
    PA1 Special wheel covers 1973–82
    —
    		 Confirmed
    PA6 Styled (painted) wheels 1973–82
    —
    		 Confirmed
    P01 Wheel covers 1973–82
    —
    		 Confirmed
    N67 Rally wheels 1973–82
    Std w/ Z77
    		 Confirmed
    P11 Glide-out spare tire carrier 1973–82
    —
    		 Confirmed
    P13 Side-mounted spare carrier 1973–82
    —
    		 Confirmed
    R04 (RO4) Single rear wheels 1973–82
    C30/K30
    		 Confirmed
    R05 (RO5) Dual rear wheels 1973–82
    C30 "Big Dooley"
    		 Confirmed
    U01 Roof marker lamps 1973–82
    —
    		 Confirmed
    UF2 Cargo area lamp 1973–82
    —
    		 Confirmed
    U16 Tachometer 1973–82
    —
    		 Confirmed
    U35 Electric quartz clock 1973–82
    —
    		 Confirmed
    U37 Cigarette lighter 1973–82
    —
    		 Confirmed
    Z53 Gauge package: voltmeter, oil pressure, temperature 1973–82
    —
    		 Confirmed
    U63 AM radio 1973–82
    —
    		 Confirmed
    U69 AM/FM radio 1973–82
    —
    		 Confirmed
    U58 AM/FM stereo radio 1973–82
    —
    		 Confirmed
    UM6 AM/FM stereo w/ cassette, seek-scan, clock c. 1981–82
    —
    		 Confirmed
    UN3 AM/FM stereo w/ cassette c. 1981–82
    —
    		 Confirmed
    UN9 Radio suppression equipment 1973–82
    —
    		 Single-source
    UP8 Stereo radio installation provisions 1973–82
    —
    		 Confirmed
    U76 Windshield antenna 1973–82
    —
    		 Confirmed
    TT5 Halogen high-beam headlamps c. 1979–82
    —
    		 Confirmed
    ZY1 Solid paint 1973–82
    —
    		 Confirmed
    ZY2 Conventional two-tone paint 1973–82
    —
    		 Confirmed
    ZY3 Special two-tone paint 1973–82
    —
    		 Confirmed
    ZY4 Deluxe two-tone paint 1973–82
    —
    		 Confirmed
    ZY5 Exterior decor two-tone package 1973–82
    —
    		 Confirmed

    Source document: chevrolet/trucks.md. Rows marked — record an option the factory offered whose RPO code is not documented in the consulted sources.