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

    Source document

    docs/rpo/gmc/sierra-squarebody.md

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    Rendered verbatim from the reference. Factory citations shown as ⛭ GM Heritage — …. For filtering, badges, and crosslinks, use the interactive Sierra — Square body (1983–1991) page.

    GMC Sierra — Square body (R/V from 1987) (1983–1991)

    The 1983–1987 Heritage kit pickup books are joint Chevrolet/GMC books: they print the GMC names beside the Chevrolet ones (Custom Deluxe/Sierra, Scottsdale/High Sierra Z62, Silverado/Sierra Classic YE9, Fleetside/Wideside E63, Stepside/Fenderside E62), so every row cites those square-body C/K pickup kits as shared platform evidence, for the C/K 1500 to 3500 (C10 to K30) pickups to 1986 and the R/V pickups in 1987, with regular, bonus (YG4) and crew cab (AS3) bodies. Their engines are the 4.1L and 4.8L sixes (LE3, L25), the 4.3L V6 (LB1, then LB4 with fuel injection in 1987), 4-barrel 5.0L, 5.7L and 7.4L V8s (LE9, LF3, LS9, LT9, LE8) to 1986, the fuel-injected L03, L05 and L19 in 1987, and the 6.2L diesel (LH6, LL4). From 1988 the kits cover the new C/K pickup; their only R/V pickup pages are the 1988 engine data pages (L05, LL4 and L19 for the R/V 20 bonus and crew cab and R/V 30 pickups) and the 1991 truck-camper page (R/V 3500 bonus and crew cab); the 1990 book also has R/V truck-camper pages, but their OCR is too garbled to cite, so no code is claimed for 1989 or 1990. NICB's 1990 VIN manual lists GMC truck conventional cab 4x2 (R) and 4x4 (V) lines beside the GMT400 lines; tire codes, seat trims and paint color numbers are not listed here.

    Codes

    Engines

    Code Description Years Models/Notes Confidence
    L03 Engine, 5.0L V8, electronic fuel injection 1987 shared platform code; cited from the square-body C/K pickup kits; the 1987 power team pages list the 5.0 liter (305 cu in) V8 with electronic fuel injection; the kit pages also print LO3 ⛭ GM Heritage — 1987 Chevrolet Truck, p.37 confirmed
    L05 Engine, 5.7L V8, electronic fuel injection 1987, 1988 shared platform code; cited from the square-body C/K pickup kits; the 1987 power team pages list the 5.7 liter (350 cu in) V8 with electronic fuel injection; the kit pages also print LO5; 1988 from the 1988 engine data page, which names the R/V 20 bonus and crew cab and R/V 30 pickups ⛭ GM Heritage — 1987 Chevrolet Truck, p.37 · 1988 Chevrolet Truck, p.41 confirmed
    L19 Engine, 7.4L V8, electronic fuel injection 1987, 1988 shared platform code; cited from the square-body C/K pickup kits; the 1987 power team pages list the 7.4 liter (454 cu in) V8 with electronic fuel injection; 1988 from the 1988 engine data page, which names the R/V 20 bonus and crew cab and R/V 30 pickups ⛭ GM Heritage — 1987 Chevrolet Truck, p.39 · 1988 Chevrolet Truck, p.54 confirmed
    L25 Engine, 4.8L L6, 1 barrel 1983–1986 shared platform code; cited from the square-body C/K pickup kits; the option pages list the 4.8 liter (292 cu in) 1 barrel L6 for heavy chassis and 30 series trucks; 1987 is left out: its value-features page calls the 4.8L L6 discontinued while the February 1987 power team page still lists it ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.23 · 1985 Chevrolet Truck, p.23 · 1986 Chevrolet Truck, p.166 confirmed
    LB1 Engine, 4.3L V6, 4 barrel 1985, 1986 shared platform code; cited from the square-body C/K pickup kits; the 1986 option page lists the 4.3 liter (262 cu in) 4 barrel V6 ⛭ GM Heritage — 1985 Chevrolet Truck, p.23 · 1986 Chevrolet Truck, p.20 confirmed
    LB4 Engine, 4.3L V6, electronic fuel injection 1987 shared platform code; cited from the square-body C/K pickup kits; the 1987 option page lists the 4.3 liter (262 cu in) V6 with electronic fuel injection ⛭ GM Heritage — 1987 Chevrolet Truck, p.51 confirmed
    LE3 Engine, 4.1L L6, 2 barrel 1983, 1984 shared platform code; cited from the square-body C/K pickup kits; the 1984 option page lists the 4.1 liter (250 cu in) 2 barrel L6 ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 confirmed
    LE8 Engine, 7.4L V8, 4 barrel 1983–1986 shared platform code; cited from the square-body C/K pickup kits; the option pages list the 7.4 liter (454 cu in) 4 barrel V8 ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.23 · 1985 Chevrolet Truck, p.23 · 1986 Chevrolet Truck, p.22 confirmed
    LE9 Engine, 5.0L V8, 4 barrel 1983–1986 shared platform code; cited from the square-body C/K pickup kits; the option pages list the 5.0 liter (305 cu in) 4 barrel V8; the 1987 value-features page names the 5.0L EFI engine LE9 while the 1987 power team and option pages print L03, so 1987 is left to L03 ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 confirmed
    LF3 Engine, 5.0L V8, 4 barrel, California 1984–1986 shared platform code; cited from the square-body C/K pickup kits; the 1984 option page offers it on 2WD 10 series only with YF5 California emissions and the MX0 automatic ⛭ GM Heritage — 1984 Chevrolet Truck, p.37 · 1985 Chevrolet Truck, p.92 · 1986 Chevrolet Truck, p.64 confirmed
    LH6 Engine, diesel, 6.2L V8 1983–1987 shared platform code; cited from the square-body C/K pickup kits; light duty emissions version of the 6.2 liter (379 cu in) diesel; requires B3J diesel equipment ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    LL4 Engine, diesel, 6.2L V8, heavy duty 1983–1988 shared platform code; cited from the square-body C/K pickup kits; heavy duty emissions version of the 6.2 liter diesel; requires B3J diesel equipment; 1988 from the 1988 engine data page, which names the R/V 20 bonus and crew cab and R/V 30 pickups ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.23 · 1985 Chevrolet Truck, p.23 · 1986 Chevrolet Truck, p.22 · 1987 Chevrolet Truck, p.39 · 1988 Chevrolet Truck, p.50 confirmed
    LS9 Engine, 5.7L V8, 4 barrel 1984–1986 shared platform code; cited from the square-body C/K pickup kits; the option pages list the 5.7 liter (350 cu in) 4 barrel V8 ⛭ GM Heritage — 1984 Chevrolet Truck, p.22 · 1985 Chevrolet Truck, p.22 · 1986 Chevrolet Truck, p.21 confirmed
    LT9 Engine, 5.7L V8, 4 barrel, heavy duty 1983–1986 shared platform code; cited from the square-body C/K pickup kits; the option pages offer this 5.7 liter (350 cu in) 4 barrel V8 with the heavy duty chassis (C6P), the 20 series bonus and crew cab and 30 series ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.25 · 1985 Chevrolet Truck, p.25 · 1986 Chevrolet Truck, p.22 confirmed

    Transmissions

    Code Description Years Models/Notes Confidence
    MM3 Transmission, manual, 3 speed 1983–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.22 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    MM4 Transmission, manual, 4 speed 1983–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.23 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    MM7 Transmission, manual, 4 speed, overdrive 1983–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.22 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    MX0 Transmission, 4 speed automatic, overdrive 1983–1987 shared platform code; cited from the square-body C/K pickup kits; the kit pages also print MXO ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.22 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    MX1 Transmission, 3 speed automatic 1983–1987 shared platform code; cited from the square-body C/K pickup kits; the kit pages also print MXI ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.23 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed

    Axles

    Code Description Years Models/Notes Confidence
    G80 Axle, rear, locking differential 1984–1986 shared platform code; cited from the square-body C/K pickup kits; the kits print it as the locking differential; the 1983 and 1987 kits print G80 only in power team footnotes that mark teams not available with it, so those years are left out; the kit pages also print G8O ⛭ GM Heritage — 1984 Chevrolet Truck, p.38 · 1985 Chevrolet Truck, p.37 · 1986 Chevrolet Truck, p.165 confirmed
    GQ1 Axle, rear, standard, non-locking 1983–1987 shared platform code; cited from the square-body C/K pickup kits; the power team charts print it in nearly every team; the meaning comes from 73-87.com, which reads it as the standard (non-Positraction) rear axle ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 single-source
    GT4 Axle, rear, 3.73 ratio 1983–1987 shared platform code; cited from the square-body C/K pickup kits; power team charts only ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    GT5 Axle, rear, 4.10 ratio 1983–1987 shared platform code; cited from the square-body C/K pickup kits; power team charts only ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.23 · 1985 Chevrolet Truck, p.23 · 1986 Chevrolet Truck, p.22 · 1987 Chevrolet Truck, p.39 confirmed
    GU2 Axle, rear, 2.73 ratio 1983, 1984 shared platform code; cited from the square-body C/K pickup kits; power team charts only ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 confirmed
    GU4 Axle, rear, 3.08 ratio 1983–1987 shared platform code; cited from the square-body C/K pickup kits; power team charts only ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    GU6 Axle, rear, 3.42 ratio 1983–1987 shared platform code; cited from the square-body C/K pickup kits; power team charts only ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.37 confirmed
    HC4 Axle, rear, 4.56 ratio 1983–1987 shared platform code; cited from the square-body C/K pickup kits; power team charts only ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.23 · 1985 Chevrolet Truck, p.23 · 1986 Chevrolet Truck, p.22 · 1987 Chevrolet Truck, p.39 confirmed

    Packages & Trims

    Code Description Years Models/Notes Confidence
    V22 Appearance package, deluxe front 1984–1987 shared platform code; cited from the square-body C/K pickup kits; the 1987 page names dual rectangular headlamps and a grille with a body color center bar; included with YE9 ⛭ GM Heritage — 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.42 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.56 confirmed
    YE9 Decor package, Sierra Classic 1983–1987 shared platform code; cited from the square-body C/K pickup kits; the kits print it as the Silverado/Sierra Classic model option, Sierra Classic being the GMC name (the Chevrolet C/K doc reads it as the Silverado decor package) ⛭ GM Heritage — 1983 Chevrolet Truck, p.28 · 1984 Chevrolet Truck, p.54 · 1985 Chevrolet Truck, p.52 · 1986 Chevrolet Truck, p.150 · 1987 Chevrolet Truck, p.68 confirmed
    YG3 Molding package, deluxe 1984–1987 shared platform code; cited from the square-body C/K pickup kits; fleetside only; included with YE9 ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    YJ6 Value decor package 1985–1987 shared platform code; cited from the square-body C/K pickup kits; solid paint with body striping and a black painted grille; not on bonus cab, crew cab or stepside; 10 series includes N67 rally wheels; 1984 is left out because the 1984 kit prints YJ6 only in a weight-table line and in the rally wheels entry ⛭ GM Heritage — 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.159 · 1987 Chevrolet Truck, p.82 confirmed
    Z62 Decor package, High Sierra 1983–1987 shared platform code; cited from the square-body C/K pickup kits; the kits print it as the Scottsdale/High Sierra model option, High Sierra being the GMC name (the Chevrolet C/K doc reads it as the Scottsdale decor package) ⛭ GM Heritage — 1983 Chevrolet Truck, p.27 · 1984 Chevrolet Truck, p.53 · 1985 Chevrolet Truck, p.51 · 1986 Chevrolet Truck, p.151 · 1987 Chevrolet Truck, p.67 confirmed
    ZQ2 Operating convenience package 1984–1987 shared platform code; cited from the square-body C/K pickup kits; includes AU3 power door locks and A31 power windows ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed

    Equipment

    Code Description Years Models/Notes Confidence
    A01 Glass, tinted, all windows 1984–1987 shared platform code; cited from the square-body C/K pickup kits; 1984–1986 rest on the sliding rear window entry, whose note states what the window gets when A01 tinted glass is ordered with it (a companion remark); the kit pages also print AO1 ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.58 confirmed
    A28 Window, rear, sliding 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.61 confirmed
    A31 Window, power 1984, 1987 shared platform code; cited from the square-body C/K pickup kits; 1985 and 1986 are left out: those pickup pages name A31 only in the operating convenience package contents ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1987 Chevrolet Truck, p.61 confirmed
    AS3 Body, crew cab 1983–1987, 1991 shared platform code; cited from the square-body C/K pickup kits; the kits print it with E63 as the crew cab body ordering code; GM later used AS3 for a rear seat on other trucks; 1991 from the 1991 truck-camper page, which prints the R/V 3500 bonus and crew cab models (R/V30943); 1991 rests on the Chevrolet-only truck books, so the row is single-source ⛭ GM Heritage — 1983 Chevrolet Truck, p.4 · 1984 Chevrolet Truck, p.34 · 1985 Chevrolet Truck, p.33 · 1986 Chevrolet Truck, p.169 · 1987 Chevrolet Truck, p.48 · 1991 Chevrolet Truck, p.64 single-source
    AU3 Locks, power door 1985, 1987 shared platform code; cited from the square-body C/K pickup kits; 1984 and 1986 are left out: those pickup pages name AU3 only in the operating convenience package contents ⛭ GM Heritage — 1985 Chevrolet Truck, p.43 · 1987 Chevrolet Truck, p.58 confirmed
    B32 Floor mats, front, color-keyed 1984, 1987 shared platform code; cited from the square-body C/K pickup kits; the 1985 (p.43) and 1986 (p.159) kit pages print the code as 832, which is not an accepted reading, so those years are left out ⛭ GM Heritage — 1984 Chevrolet Truck, p.45 · 1987 Chevrolet Truck, p.58 confirmed
    B3J Equipment, diesel 1983–1987 shared platform code; cited from the square-body C/K pickup kits; required with the LH6 and LL4 diesels ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.33 · 1985 Chevrolet Truck, p.33 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.48 confirmed
    B84 Moldings, body side, black 1986 shared platform code; cited from the square-body C/K pickup kits; fleetside only; 1984, 1985 and 1987 are left out: those pages name B84 only in package contents or exclusions, and the 1985 option line prints 384 ⛭ GM Heritage — 1986 Chevrolet Truck, p.158 confirmed
    B85 Moldings, body side, bright 1985 shared platform code; cited from the square-body C/K pickup kits; fleetside only; 1984, 1986 and 1987 are left out: those pages name B85 only in other options’ contents and exclusions ⛭ GM Heritage — 1985 Chevrolet Truck, p.44 confirmed
    B93 Guards, door edge 1986 shared platform code; cited from the square-body C/K pickup kits; the 1984 kit page (p.46) prints the code as 893, which is not an accepted reading, so 1984 is left out ⛭ GM Heritage — 1986 Chevrolet Truck, p.157 confirmed
    C42 Heater, front, heavy duty 1985–1987 shared platform code; cited from the square-body C/K pickup kits; not with C60 air conditioning ⛭ GM Heritage — 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.158 · 1987 Chevrolet Truck, p.58 confirmed
    C60 Air conditioning, All-Weather 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 1983, 1985 and 1987 rest on a power team requirement remark (with the MX1 automatic and C60 air conditioning, KC4 is required); the kit pages also print C6O ⛭ GM Heritage — 1983 Chevrolet Truck, p.18 · 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.26 · 1986 Chevrolet Truck, p.159 · 1987 Chevrolet Truck, p.43 confirmed
    C6P Chassis, heavy duty 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 20 series heavy duty chassis; 1983 and 1987 from the body ordering codes, 1984–1986 from other options’ availability and price lines that name it ⛭ GM Heritage — 1983 Chevrolet Truck, p.4 · 1984 Chevrolet Truck, p.37 · 1985 Chevrolet Truck, p.36 · 1986 Chevrolet Truck, p.169 · 1987 Chevrolet Truck, p.49 confirmed
    C91 Lamp, dome 1985–1986 shared platform code; cited from the square-body C/K pickup kits; 1984 is left out: its page names C91 only in the YE9 package contents (the 1984 dome lamp line prints ca1); 1987 is left out: its pages name C91 only in package contents, and its dome lamp line prints c91 ⛭ GM Heritage — 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.158 confirmed
    CD4 Wipers, windshield, intermittent 1984–1987 shared platform code; cited from the square-body C/K pickup kits; not with the 3 speed manual (MM3) ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.61 confirmed
    D44 Mirror, outside, below eye line, painted 1986 shared platform code; cited from the square-body C/K pickup kits; 9 x 6.5 inch, left-hand and right-hand ⛭ GM Heritage — 1986 Chevrolet Truck, p.158 confirmed
    D45 Mirror, outside, below eye line, stainless steel 1986 shared platform code; cited from the square-body C/K pickup kits; 9 x 6.5 inch, left-hand and right-hand ⛭ GM Heritage — 1986 Chevrolet Truck, p.158 confirmed
    D73 Rails, pickup box side 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    DF2 Mirror, outside, left-hand and right-hand, camper style, stainless steel 1984, 1986, 1987 shared platform code; cited from the square-body C/K pickup kits; 7.5 x 10.5 inch head on adjustable arms ⛭ GM Heritage — 1984 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.158 · 1987 Chevrolet Truck, p.58 confirmed
    DG5 Mirror, outside, senior West Coast type, painted 1984, 1986, 1987 shared platform code; cited from the square-body C/K pickup kits; only in: 30 series; shipped loose for dealer installation ⛭ GM Heritage — 1984 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.158 · 1987 Chevrolet Truck, p.58 confirmed
    E62 Body equipment, stepside pickup box 1983–1987 shared platform code; cited from the square-body C/K pickup kits; printed as the Stepside/Fenderside body ordering code ⛭ GM Heritage — 1983 Chevrolet Truck, p.4 · 1984 Chevrolet Truck, p.33 · 1985 Chevrolet Truck, p.33 · 1986 Chevrolet Truck, p.169 · 1987 Chevrolet Truck, p.48 confirmed
    E63 Body equipment, fleetside pickup box 1983–1987, 1991 shared platform code; cited from the square-body C/K pickup kits; printed as the Fleetside/Wideside body ordering code; 1991 from the 1991 truck-camper page, which prints the R/V 3500 bonus and crew cab models (R/V30943); 1991 rests on the Chevrolet-only truck books, so the row is single-source ⛭ GM Heritage — 1983 Chevrolet Truck, p.4 · 1984 Chevrolet Truck, p.33 · 1985 Chevrolet Truck, p.33 · 1986 Chevrolet Truck, p.169 · 1987 Chevrolet Truck, p.48 · 1991 Chevrolet Truck, p.64 single-source
    F51 Shock absorbers, front and rear, heavy duty 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    F58 Stabilizer bar, front, heavy duty 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    F59 Stabilizer bar, front 1984–1987 shared platform code; cited from the square-body C/K pickup kits; printed in the stabilizer bar block of the option pages; the meaning comes from 73-87.com ⛭ GM Heritage — 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 single-source
    F60 Spring, front, heavy duty 1984–1987 shared platform code; cited from the square-body C/K pickup kits; the kit pages also print F6O ⛭ GM Heritage — 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    G50 Spring, rear, heavy duty 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 1983 from the GVWR chart; the kit pages also print G5O ⛭ GM Heritage — 1983 Chevrolet Truck, p.21 · 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    G51 Spring, rear, extra capacity 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 1983 from the GVWR chart ⛭ GM Heritage — 1983 Chevrolet Truck, p.20 · 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    G60 Spring, rear, main and auxiliary 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    J50 Brakes, power 1984, 1986, 1987 shared platform code; cited from the square-body C/K pickup kits; 1984 and 1987 from other options’ requirement remarks (available only with J50 or J55 power brakes) ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.59 confirmed
    J55 Brakes, power, heavy duty 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.42 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.57 confirmed
    K05 Heater, engine block 1985–1987 shared platform code; cited from the square-body C/K pickup kits; 600 watt, 120 volt; included with V10; the kit pages also print KO5 ⛭ GM Heritage — 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.158 · 1987 Chevrolet Truck, p.58 confirmed
    K22 Generator, 94 amp 1986 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1986 Chevrolet Truck, p.159 confirmed
    K34 Speed control, electronic 1986, 1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    K46 Air cleaner, pre-cleaner 1985–1987 shared platform code; cited from the square-body C/K pickup kits; not with the L25 4.8L ⛭ GM Heritage — 1985 Chevrolet Truck, p.42 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.56 confirmed
    K81 Generator, 66 amp 1984–1986 shared platform code; cited from the square-body C/K pickup kits; 1983 is left out: its page names K81 only in the B3J diesel equipment package contents ⛭ GM Heritage — 1984 Chevrolet Truck, p.45 · 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.159 confirmed
    KC4 Cooling system, engine oil 1983–1987 shared platform code; cited from the square-body C/K pickup kits; the kits print it as the engine oil cooler; 1987 from the air conditioning entry’s requirement remark ⛭ GM Heritage — 1983 Chevrolet Truck, p.18 · 1984 Chevrolet Truck, p.26 · 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.159 · 1987 Chevrolet Truck, p.56 confirmed
    N33 Steering wheel, Comfortilt 1984–1987 shared platform code; cited from the square-body C/K pickup kits; not with the 3 speed manual (MM3) ⛭ GM Heritage — 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    N41 Steering, power 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 1983 from a power team requirement remark ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    N51 Steering, power, not desired 1984–1987 shared platform code; cited from the square-body C/K pickup kits; no-charge delete of power steering ⛭ GM Heritage — 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.45 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    N67 Wheels, rally 1983–1987 shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; special hub caps and trim rings; every year rests on tire entries’ requirement remarks (requires N67 or PA6 wheels), as no option line prints a legible N67 ⛭ GM Heritage — 1983 Chevrolet Truck, p.20 · 1984 Chevrolet Truck, p.27 · 1985 Chevrolet Truck, p.27 · 1986 Chevrolet Truck, p.162 · 1987 Chevrolet Truck, p.54 confirmed
    N90 Wheels, aluminum, cast 1985–1987 shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; four 15 x 7 wheels; the kit pages also print N9O ⛭ GM Heritage — 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.61 confirmed
    NL2 Fuel tank, auxiliary 1984–1987 shared platform code; cited from the square-body C/K pickup kits; right-hand frame mounted ⛭ GM Heritage — 1984 Chevrolet Truck, p.47 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.156 · 1987 Chevrolet Truck, p.60 confirmed
    NY7 Shield, transfer case 1984–1987 shared platform code; cited from the square-body C/K pickup kits; only in: 4WD ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    P01 Wheel covers, bright metal 1984–1987 shared platform code; cited from the square-body C/K pickup kits; the kit pages also print PO1 ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.60 confirmed
    P13 Carrier, spare tire, side mounted 1987 shared platform code; cited from the square-body C/K pickup kits; fleetside only; printed in the spare carrier block of the 1987 option page; the meaning comes from 73-87.com ⛭ GM Heritage — 1987 Chevrolet Truck, p.57 single-source
    PA1 Wheel covers, special 1984–1987 shared platform code; cited from the square-body C/K pickup kits; the kit pages also print PAI ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.62 confirmed
    PA6 Wheels, styled 1983–1987 shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; special hub caps; every year rests on tire entries’ requirement remarks (requires N67 or PA6 wheels), as no option line prints a legible PA6 ⛭ GM Heritage — 1983 Chevrolet Truck, p.20 · 1984 Chevrolet Truck, p.27 · 1985 Chevrolet Truck, p.27 · 1986 Chevrolet Truck, p.162 · 1987 Chevrolet Truck, p.54 confirmed
    PF2 Wheels, aluminum, forged 1987 shared platform code; cited from the square-body C/K pickup kits; only in: 10 series; four 15 x 7 wheels ⛭ GM Heritage — 1987 Chevrolet Truck, p.61 confirmed
    R04 Wheel, single rear 1984–1987 shared platform code; cited from the square-body C/K pickup kits; only in: 30 series fleetside; the kit pages also print RO4 ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.63 confirmed
    R05 Wheel, dual rear 1983–1987 shared platform code; cited from the square-body C/K pickup kits; only in: 30 series fleetside; 1983 from the GVWR chart; the kit pages also print RO5 ⛭ GM Heritage — 1983 Chevrolet Truck, p.22 · 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.63 confirmed
    TP2 Battery, auxiliary 1984, 1986, 1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.56 confirmed
    TT5 Headlamps, halogen high beam 1985–1987 shared platform code; cited from the square-body C/K pickup kits; the 1984 kit page (p.45) prints the code as TTS, which is not an accepted reading, so 1984 is left out ⛭ GM Heritage — 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.158 · 1987 Chevrolet Truck, p.58 confirmed
    U01 Lamp, roof marker, five 1985–1987 shared platform code; cited from the square-body C/K pickup kits; included with R05 dual rear wheels; 1984 is left out: the 1984 page names U01 only in another option’s contents and its option line prints UDI; the kit pages also print UO1 ⛭ GM Heritage — 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.158 · 1987 Chevrolet Truck, p.58 confirmed
    U35 Clock, electric, quartz 1983, 1984, 1986, 1987 shared platform code; cited from the square-body C/K pickup kits; 1983 and 1986 from the instrument cluster feature pages, which name the optional electric clock (RPO U35) ⛭ GM Heritage — 1983 Chevrolet Truck, p.33 · 1984 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.145 · 1987 Chevrolet Truck, p.57 confirmed
    U37 Lighter, cigarette 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.45 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.158 · 1987 Chevrolet Truck, p.58 confirmed
    U58 Radio, AM/FM stereo 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    U63 Radio, AM 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    U69 Radio, AM/FM 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    U76 Antenna, windshield 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    UA1 Battery, heavy duty 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 1985 from the power team requirement remarks (requires N41 and UA1); the 1984 page prints the battery line as UAI ⛭ GM Heritage — 1983 Chevrolet Truck, p.15 · 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.23 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.56 confirmed
    UM6 Radio, AM/FM stereo, electronically tuned, seek and scan, cassette tape, digital clock 1986, 1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    UN3 Radio, AM/FM stereo, cassette tape 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.46 · 1985 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.157 · 1987 Chevrolet Truck, p.59 confirmed
    V01 Radiator, heavy duty 1984–1987 shared platform code; cited from the square-body C/K pickup kits; the kit pages also print VO1, VOI ⛭ GM Heritage — 1984 Chevrolet Truck, p.44 · 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.159 · 1987 Chevrolet Truck, p.57 confirmed
    V02 Radiator and transmission oil cooler, heavy duty 1983–1987 shared platform code; cited from the square-body C/K pickup kits; automatic transmissions only; 1983 from a power team requirement remark; the kit pages also print VO2 ⛭ GM Heritage — 1983 Chevrolet Truck, p.18 · 1984 Chevrolet Truck, p.44 · 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.159 · 1987 Chevrolet Truck, p.57 confirmed
    V10 Package, cold climate 1984, 1986, 1987 shared platform code; cited from the square-body C/K pickup kits; includes special insulation, a special heater and defroster, K05 engine block heater and UA1 heavy duty battery; 1985 is left out: its pages name V10 only in other options’ inclusion remarks ⛭ GM Heritage — 1984 Chevrolet Truck, p.44 · 1986 Chevrolet Truck, p.159 · 1987 Chevrolet Truck, p.57 confirmed
    V31 Guards, front bumper, chromed 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.42 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.57 confirmed
    V42 Bumper, rear step, chromed 1984–1986 shared platform code; cited from the square-body C/K pickup kits; printed in the chromed bumper block of the option pages ⛭ GM Heritage — 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.42 · 1986 Chevrolet Truck, p.160 confirmed
    V43 Bumper, rear step, painted 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.42 · 1986 Chevrolet Truck, p.160 · 1987 Chevrolet Truck, p.57 confirmed
    V76 Tow hooks, front 1984–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1984 Chevrolet Truck, p.48 · 1985 Chevrolet Truck, p.46 · 1986 Chevrolet Truck, p.155 · 1987 Chevrolet Truck, p.60 confirmed
    VF1 Bumper, rear, chromed 1984–1986 shared platform code; cited from the square-body C/K pickup kits; printed in the chromed bumper block of the option pages ⛭ GM Heritage — 1984 Chevrolet Truck, p.43 · 1985 Chevrolet Truck, p.42 · 1986 Chevrolet Truck, p.160 confirmed
    YG4 Body, bonus cab 1983–1987, 1991 shared platform code; cited from the square-body C/K pickup kits; the kits print it with E63 as the bonus cab body ordering code; GM later used YG4 for "seats, optional, not desired" on other trucks; 1991 from the 1991 truck-camper page, which prints the R/V 3500 bonus and crew cab models (R/V30943); 1991 rests on the Chevrolet-only truck books, so the row is single-source ⛭ GM Heritage — 1983 Chevrolet Truck, p.4 · 1984 Chevrolet Truck, p.4 · 1985 Chevrolet Truck, p.33 · 1986 Chevrolet Truck, p.169 · 1987 Chevrolet Truck, p.48 · 1991 Chevrolet Truck, p.64 single-source
    Z53 Gages, voltmeter, temperature and oil pressure 1983, 1985–1987 shared platform code; cited from the square-body C/K pickup kits; 1983 from the instrument cluster feature page; 1984 is left out: its standalone gauges line prints 253 and the code otherwise appears only in package contents ⛭ GM Heritage — 1983 Chevrolet Truck, p.33 · 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.159 · 1987 Chevrolet Truck, p.58 confirmed
    Z75 Shock absorbers, front, quad 1986 shared platform code; cited from the square-body C/K pickup kits; only in: 4WD 10 and 20 series regular cab; includes heavy duty rear shocks and a front axle bumper; the 1984, 1985 and 1987 pages name Z75 only in spring and stabilizer price lines, which do not date a year ⛭ GM Heritage — 1986 Chevrolet Truck, p.157 confirmed
    Z81 Camper special chassis equipment 1984–1986 shared platform code; cited from the square-body C/K pickup kits; includes camper body wiring harness; 1984 and 1985 from the GVWR chart line for camper special chassis equipment; 1987 is left out: its pages name Z81 only in other options’ exclusions and contents ⛭ GM Heritage — 1984 Chevrolet Truck, p.29 · 1985 Chevrolet Truck, p.29 · 1986 Chevrolet Truck, p.160 confirmed

    Paint

    Code Description Years Models/Notes Confidence
    ZY1 Color combination, solid 1983–1987 shared platform code; cited from the square-body C/K pickup kits ⛭ GM Heritage — 1983 Chevrolet Truck, p.37 · 1984 Chevrolet Truck, p.36 · 1985 Chevrolet Truck, p.61 · 1986 Chevrolet Truck, p.167 · 1987 Chevrolet Truck, p.50 confirmed
    ZY2 Color combination, conventional two-tone 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 1983 from the color chart heading; 1984 and 1985 from the paint application pages ⛭ GM Heritage — 1983 Chevrolet Truck, p.37 · 1984 Chevrolet Truck, p.64 · 1985 Chevrolet Truck, p.63 · 1986 Chevrolet Truck, p.167 · 1987 Chevrolet Truck, p.50 confirmed
    ZY3 Color combination, special two-tone 1983–1987 shared platform code; cited from the square-body C/K pickup kits; fleetside only; 1983 and 1985 from the color chart headings ⛭ GM Heritage — 1983 Chevrolet Truck, p.37 · 1984 Chevrolet Truck, p.36 · 1985 Chevrolet Truck, p.61 · 1986 Chevrolet Truck, p.167 · 1987 Chevrolet Truck, p.51 confirmed
    ZY4 Color combination, deluxe two-tone 1983–1987 shared platform code; cited from the square-body C/K pickup kits; fleetside only ⛭ GM Heritage — 1983 Chevrolet Truck, p.39 · 1984 Chevrolet Truck, p.36 · 1985 Chevrolet Truck, p.35 · 1986 Chevrolet Truck, p.167 · 1987 Chevrolet Truck, p.51 confirmed
    ZY5 Color combination, exterior decor package, two-tone with striping 1983–1987 shared platform code; cited from the square-body C/K pickup kits; fleetside only; dual-tone body side and rear decal striping; not with R05 dual rear wheels ⛭ GM Heritage — 1983 Chevrolet Truck, p.39 · 1984 Chevrolet Truck, p.37 · 1985 Chevrolet Truck, p.35 · 1986 Chevrolet Truck, p.167 · 1987 Chevrolet Truck, p.51 confirmed
    ZY6 Color combination, custom two-tone 1985, 1987 shared platform code; cited from the square-body C/K pickup kits; 1985 from the color chart heading; 1987 from the color chart, which marks colors for ZY2 and ZY6 only ⛭ GM Heritage — 1985 Chevrolet Truck, p.61 · 1987 Chevrolet Truck, p.77 confirmed
    ZY9 Color combination, special two-tone, Big Dooley 1983–1987 shared platform code; cited from the square-body C/K pickup kits; only in: 30 series fleetside with R05 dual rear wheels ⛭ GM Heritage — 1983 Chevrolet Truck, p.37 · 1984 Chevrolet Truck, p.35 · 1985 Chevrolet Truck, p.34 · 1986 Chevrolet Truck, p.167 · 1987 Chevrolet Truck, p.51 confirmed

    Internal / Process

    Code Description Years Models/Notes Confidence
    NA5 Emission system, federal 1983–1987 shared platform code; cited from the square-body C/K pickup kits; 1983, 1984, 1986 and 1987 from the power team blocks headed with NA5 standard emissions; 1985 from the roof marker lamp requirement remark internal code ⛭ GM Heritage — 1983 Chevrolet Truck, p.13 · 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.43 · 1986 Chevrolet Truck, p.20 · 1987 Chevrolet Truck, p.43 confirmed
    NA6 Emission system, high altitude 1984–1987 shared platform code; cited from the square-body C/K pickup kits; 1984 and 1985 from the power team blocks headed with NA6 high altitude emissions; 1987 from the roof marker lamp requirement remark (the 1987 option line prints NAG) internal code ⛭ GM Heritage — 1984 Chevrolet Truck, p.21 · 1985 Chevrolet Truck, p.21 · 1986 Chevrolet Truck, p.166 · 1987 Chevrolet Truck, p.58 confirmed
    YF5 Emission system, California 1983–1987 shared platform code; cited from the square-body C/K pickup kits internal code ⛭ GM Heritage — 1983 Chevrolet Truck, p.14 · 1984 Chevrolet Truck, p.37 · 1985 Chevrolet Truck, p.36 · 1986 Chevrolet Truck, p.166 · 1987 Chevrolet Truck, p.51 confirmed

    Sources

    Factory documents (T1)

    • [HK] chevrolet-trucks/1983-Chevrolet-Truck.txt — 1983 C/K pickup book, pages 4–41 (model selector, Custom Deluxe/Sierra, Scottsdale/High Sierra and Silverado/Sierra Classic feature pages, power teams, GVWR chart, color charts); a joint Chevrolet/GMC book
    • [HK] chevrolet-trucks/1984-Chevrolet-Truck.txt — 1984 C/K pickup book (power teams, option price pages, feature pages, color charts)
    • [HK] chevrolet-trucks/1985-Chevrolet-Truck.txt — 1985 C/K pickup book, pages 4–66, plus engine page 92 for LF3; the file's later 1986 and 1988 pages are not cited
    • [HK] chevrolet-trucks/1986-Chevrolet-Truck.txt — 1986 C/K pickup book (pages 3–24 and 135–176, engine page 64 for LF3); the chassis-cab pages are not cited
    • [HK] chevrolet-trucks/1987-Chevrolet-Truck.txt — 1987 R/V pickup book
    • [HK] chevrolet-trucks/1988-Chevrolet-Truck.txt — 1988 engine data pages 41, 50 and 54 only (the C/K pickup pages belong to the GMT400 doc)
    • [HK] chevrolet-trucks/1991-Chevrolet-Truck.txt — 1991 truck-camper model code page 64 only
    • NICB VIN manuals: docs/reference/nicb/nicb1987-gm.txt p.92; docs/reference/nicb/nicb1990-gm.txt p.82

    Other sources