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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/buick/regal-g-body.md

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    Rendered verbatim from the reference. Factory citations shown as ⛭ GM Heritage — …. For filtering, badges, and crosslinks, use the interactive Regal — G-body (1983–1987) page.

    Buick Regal — G-body, rear-drive (1983–1987)

    The rear-drive G-body Regal of these years was a coupe throughout, with a sedan in 1983–1984 and a wagon in 1983 (Wikipedia's production table); the NICB manuals list the Regal, Regal Sport and Regal Limited lines and, from 1984, the Regal T-Type, and gnttype.org gives the 1985–1987 models as the J47 coupe, M47 Limited coupe and K47 T-Type coupe. Engines run from the 3.8L V6 (LD5) throughout, the 4.1L V6 (LC4) and 4.3L V6 diesel (LT6) in 1983–1984 and the 5.7L V8 diesel (LF9) to 1985, to the turbocharged 3.8L V6 (LM9, then the intercooled LC2 from 1986) and the 5.0L V8 (LV2) in 1986–1987. No GM order guide, data book or Heritage kit for the Regal is in the archive: the codes come from gnttype.org (a 1987 option and price sheet given as an example by John Z. Gyekenyesi, its 1983–1987 VIN engine tables, its Grand National package lists and its production page), Wikipedia, one Before Black caption, and the Chevrolet Monte Carlo kits for the codes the two G-body coupes share; buickturboregal.com's 1984–1987 code list, which gives no years, only corroborates. Only the 1987 sheet dates the options, so nearly every equipment row is 1987 alone: the options of 1983–1986 are a gap in the sources, not a finding that they were not offered.

    Codes

    Engines

    Code Description Years Models/Notes Confidence
    LD5 Engine, 3.8L V6, 231 cu in, 2 barrel 1983–1987 the base engine; not with WE2 (1987); every year from gnttype.org's VIN engine tables, 1987 also from its option sheet; shared G-body powertrain code, cited from the Monte Carlo kit (1983–1984) ⛭ GM Heritage — 1983 Chevrolet Monte Carlo, p.30 ⛭ GM Heritage — 1984 Chevrolet Monte Carlo, p.36 confirmed
    LC4 Engine, 4.1L V6, 252 cu in, 4 barrel 1983–1984 gnttype.org's 1983 and 1984 VIN engine tables; Wikipedia gives the 4.1L to the Regal through 1984 confirmed
    LT6 Engine, diesel, 4.3L V6 1983–1984 gnttype.org's 1983 and 1984 VIN engine tables; Wikipedia gives the 4.3L diesel V6 to the Regal through 1984; shared G-body powertrain code, cited from the Monte Carlo kit (1983) ⛭ GM Heritage — 1983 Chevrolet Monte Carlo, p.30 confirmed
    LF9 Engine, diesel, 5.7L V8 1983–1985 Wikipedia gives the 5.7L diesel V8 to the Regal through 1985, and buickturboregal.com lists LF9 among the Regal's codes; gnttype.org's VIN tables do not list it under the Regal; shared G-body powertrain code, cited from the Monte Carlo kit (1983–1984) ⛭ GM Heritage — 1983 Chevrolet Monte Carlo, p.30 ⛭ GM Heritage — 1984 Chevrolet Monte Carlo, p.36 confirmed
    LM9 Engine, 3.8L V6, turbocharged, sequential fuel injection 1984–1985 T-Type and Grand National; gnttype.org's 1984 and 1985 VIN tables (engine VIN code 9); its 1983 table also prints LM9, as a carbureted turbo, but its own 1983 example gives the 4-barrel turbo engine as VIN code 3 with no RPO code, so 1983 is not claimed confirmed
    LC2 Engine, 3.8L V6, turbocharged, intercooled, sequential fuel injection 1986–1987 gnttype.org's 1986 and 1987 VIN tables (engine VIN code 7) and its 1987 option sheet: requires Y56 and C60, and included with WE2; Wikipedia dates the intercooler and the LC2 code from 1986 confirmed
    LV2 Engine, 5.0L V8, 307 cu in, 4 barrel 1986–1987 gnttype.org's 1986 and 1987 VIN tables and its 1987 option sheet (not with WE2; requires C60 with YF5); Wikipedia gives the Regal the Oldsmobile 307 V8 for 1986–1987; 1985 is left out: gnttype.org's 1985 VIN table lists it under the Regal, but Wikipedia starts it in 1986 confirmed

    Transmissions

    Code Description Years Models/Notes Confidence
    MX1 Transmission, 3 speed automatic 1987 standard; not with LC2 or WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.47 confirmed
    MX0 Transmission, 4 speed automatic, overdrive 1987 not with LD5; included with WE2, whose lists call it the 200-4R; gnttype.org's 1987 option sheet; 1986 is left out because gnttype.org prints it that year only inside the WE2 package; the kit's 1987 price page prints MXO; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.47 confirmed

    Axles

    Code Description Years Models/Notes Confidence
    G80 Axle, rear, limited slip differential 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    GM8 Axle, rear, 2.56 ratio 1987 no-charge option; gnttype.org's 1987 option sheet confirmed
    GU4 Axle, rear, 3.08 ratio 1987 no-charge option; gnttype.org's 1987 option sheet confirmed
    GU5 Axle, rear, 3.23 ratio 1987 no-charge option; gnttype.org's 1987 option sheet confirmed

    Packages & Trims

    Code Description Years Models/Notes Confidence
    WE2 Grand National package 1984–1987 includes LC2, FE2, D55, D35, NP5, C60, QYZ, N83, a 3.42 axle, spoilers and its own interior (1987 option sheet); black paint; 1984–1985 from gnttype.org's production page (GM Canada's Regal import counts by year for option WE2), 1986 from gnttype.org's WE2 package list, 1987 from its option sheet confirmed
    WH1 Designer package 1984–1986 gnttype.org's production page gives WH1 production for 1984, 1985 and 1986; the wording is buickturboregal.com's, which groups WH1 with the T-Type confirmed
    WE4 Turbo T package 1987 gnttype.org's production page and its 1987 dealer-literature note; Wikipedia calls it a lightweight option confirmed
    Y56 T package 1987 includes FE2, gas shocks, aluminum wheels, QYZ and NP5; gnttype.org's 1987 option sheet confirmed
    W02 Exterior sport package, blackout moldings 1987 gnttype.org's 1987 option sheet; Wikipedia prints WO2 confirmed
    WF6 Exterior molding package, wide rocker panel and belt reveal moldings 1987 not with W02 or WE2; gnttype.org's 1987 option sheet confirmed
    T1Y Value package, discount 1987 a price discount when D64, UM6 or UX1, U75 or US7 and one of P12, N91, N78 or Y56 are ordered together, with a code the sheet prints as AI3; gnttype.org's 1987 option sheet confirmed
    Y44 Decor package 1983 T-Type; designer's accent paint, blacked-out grille, wiper arms and lamp bezels, wide rocker moldings and a sport steering wheel; only Before Black's 1983 T-Type caption gives it, and that caption says the pictured car (from Motor Trend, August 1982) is likely a pre-production version single-source

    Equipment

    Code Description Years Models/Notes Confidence
    A65 Seat, front, notchback bench, cloth 1987 standard; gnttype.org's 1987 option sheet confirmed
    AK1 Seat belts, deluxe, color-coordinated 1987 standard; gnttype.org's 1987 option sheet confirmed
    AM6 Seat, front, 55/45 divided bench, cloth 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    AR9 Seats, front bucket, reclining 1987 includes the recliners and D55; no charge with WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    AT6 Seatback recliner, passenger, manual 1987 with AM6; no charge with AR9 or WE2; gnttype.org's 1987 option sheet confirmed
    AU3 Locks, power door 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    A01 Glass, tinted 1987 gnttype.org's 1987 option sheet confirmed
    A31 Windows, power 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    A90 Trunk lid release, power 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    B32 Floor mats, front, carpet savers 1987 gnttype.org's 1987 option sheet confirmed
    B33 Floor mats, rear, carpet savers 1987 gnttype.org's 1987 option sheet confirmed
    B34 Floor mats, front, carpet savers with inserts 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    B35 Floor mats, rear, carpet savers with inserts 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    B48 Trunk trim covering 1987 gnttype.org's 1987 option sheet confirmed
    B83 Molding, rocker panel 1987 standard; gnttype.org's 1987 option sheet confirmed
    B88 Moldings, body side, wide protective 1987 only with W02 or WE2; gnttype.org's 1987 option sheet confirmed
    B91 Door edge guards, black 1987 only with W02 or WE2; gnttype.org's 1987 option sheet confirmed
    B93 Door edge guards, chrome 1987 not with W02 or WE2; gnttype.org's 1987 option sheet; the kit's weight page prints it as BPO B93; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    B96 Molding, wheel opening 1987 standard, with roof drip moldings; gnttype.org's 1987 option sheet confirmed
    C04 Roof cover, landau, heavily padded vinyl 1987 not with W02 or WE2; gnttype.org's 1987 option sheet; the kit page prints CO4; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    CB4 Roof cover, landau, vinyl 1987 not with W02 or WE2; gnttype.org's 1987 option sheet confirmed
    CC1 Roof, hatch 1987 not with C95; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    CD4 Windshield wipers, 2 speed, low speed delay 1987 requires N33 when ordered with D55; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    CF5 Astroroof, power, electric sliding 1987 gnttype.org's 1987 option sheet confirmed
    C49 Defogger, rear window, electric 1987 required in New York State; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    C60 Air conditioning, manual 1987 no charge with WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.88 confirmed
    C95 Lamps, reading, front seat 1987 not with CC1; gnttype.org's 1987 option sheet confirmed
    D34 Mirror, visor vanity, passenger 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.89 confirmed
    D35 Mirrors, outside, left-hand remote, right-hand manual 1987 no charge with WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.89 confirmed
    D55 Console, full length 1987 no charge, and only with AR9; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.89 confirmed
    D64 Mirror, visor vanity, passenger, illuminated 1987 gnttype.org's 1987 option sheet confirmed
    D68 Mirrors, sport, dual remote control 1987 priced lower with WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.89 confirmed
    D83 Paint, special solid color 1987 not with WE2; gnttype.org's 1987 option sheet confirmed
    D84 Paint, designer's accent 1987 not with body side stripes, W02 or WE2; gnttype.org's 1987 option sheet confirmed
    F40 Suspension, firm ride and handling 1987 not with F41, Y56 or WE2; gnttype.org's 1987 option sheet confirmed
    F41 Suspension, Gran Touring 1987 not with F40, Y56 or WE2; gnttype.org's 1987 option sheet; the Monte Carlo kit calls it the sport suspension; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    FE2 Suspension, special Gran Touring 1987 only with Y56 or WE2; gnttype.org's 1987 option sheet confirmed
    J50 Brakes, power, front disc 1987 standard; gnttype.org's 1987 option sheet confirmed
    K05 Heater, engine block 1987 not with LV2; gnttype.org's 1987 option sheet; the kit's weight page prints PPO KO5; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.89 confirmed
    K22 Generator, Delcotron, 94 amp 1987 not with LC2; priced by air conditioning and engine; gnttype.org's 1987 option sheet confirmed
    K34 Cruise control, electronic 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    K99 Generator, Delcotron, 85 amp 1987 requires air conditioning with LD5; gnttype.org's 1987 option sheet confirmed
    N33 Steering wheel, tilt 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    N34 Steering wheel, sport 1987 not with WE2 or Y56; gnttype.org's 1987 option sheet confirmed
    N41 Steering, power 1987 standard; gnttype.org's 1987 option sheet confirmed
    N78 Wheels, aluminum, sport, high tech 1987 not with Y56 or WE2; gnttype.org's 1987 option sheet confirmed
    N83 Wheels, 15 in, chrome plated 1987 only with WE2; gnttype.org's 1987 option sheet confirmed
    N91 Wheel covers, wire, custom, locking 1987 not with Y56 or WE2; gnttype.org's 1987 option sheet confirmed
    NP5 Steering wheel, sport, leather-wrapped 1987 only with WE2 or Y56; gnttype.org's 1987 option sheet confirmed
    P01 Wheel covers, deluxe 1987 standard; gnttype.org's 1987 option sheet confirmed
    P12 Wheels, chrome plated 1987 not with Y56 or WE2; gnttype.org's 1987 option sheet confirmed
    QHY Tires, P205/70R14, steel belted radial, whitewall 1987 requires F41; not with Y56 or WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    QMX Tires, P195/75R14, steel belted radial, whitewall 1987 standard; not with F41, Y56 or WE2; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    QYH Tires, P215/65R15, steel belted radial, white letter 1987 requires Y56 or WE2; gnttype.org's 1987 option sheet confirmed
    QYZ Tires, P215/65R15, steel belted radial, blackwall 1987 only with WE2; gnttype.org's 1987 option sheet confirmed
    TR9 Lamp group 1987 standard; trunk, engine, glove box, ashtray and courtesy lamps; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    TT5 Headlamps, tungsten halogen, high beam 1987 gnttype.org's 1987 option sheet confirmed
    T63 Headlamps-on indicator 1987 gnttype.org's 1987 option sheet confirmed
    T82 Headlamp control, Twilight Sentinel 1987 gnttype.org's 1987 option sheet confirmed
    T87 Lamps, cornering 1987 not with W02 or WE2; requires N33 and CD4 with AR9; gnttype.org's 1987 option sheet confirmed
    UA1 Battery, heavy duty 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.46 confirmed
    UA6 Theft deterrent system, starter interrupt 1987 requires AU3; gnttype.org's 1987 option sheet confirmed
    UK4 Radio, AM/FM stereo, electronically tuned, seek and scan 1987 gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    UL5 Radio delete 1987 a credit option; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    UM6 Radio, AM/FM stereo, electronically tuned, seek and scan, cassette tape, auto reverse, clock 1987 includes U66; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    UM7 Radio, AM/FM stereo, electronically tuned, seek and scan, clock 1987 includes U66; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    UW4 Speaker system, Concert Sound 1987 requires UM6, UM7 or UX1; gnttype.org's 1987 option sheet confirmed
    UX1 Radio, AM/FM stereo, electronically tuned, seek and scan, cassette tape, graphic equalizer, clock 1987 includes U66; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    U05 Horns, dual 1987 standard; gnttype.org's 1987 option sheet confirmed
    U23 Odometer, trip 1987 no charge with LC2, U52 or WE2; gnttype.org's 1987 option sheet confirmed
    U52 Instrumentation, electronic 1987 priced lower with WE2; gnttype.org's 1987 option sheet confirmed
    U63 Radio, AM 1987 standard; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.87 confirmed
    U66 Speakers, extended range, dual rear 1987 not with U63; included with UM6, UM7 and UX1; gnttype.org's 1987 option sheet; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    U73 Antenna, fixed mast 1987 standard; gnttype.org's 1987 option sheet confirmed
    U75 Antenna, power, automatic 1987 not with W02 or WE2; gnttype.org's 1987 option sheet; buickturboregal.com calls it the bright-mount antenna; shared G-body code, cited from the Monte Carlo kit ⛭ GM Heritage — 1987 Chevrolet Monte Carlo, p.40 confirmed
    US7 Antenna, power, automatic 1987 only with W02 or WE2; gnttype.org's 1987 option sheet; buickturboregal.com calls it the black-mount antenna confirmed
    V08 Cooling, heavy duty, engine and transmission 1987 not with LC2 or WE2; gnttype.org's 1987 option sheet confirmed
    VE5 Bumper rub strips, front and rear 1987 standard; gnttype.org's 1987 option sheet confirmed
    VK3 License plate bracket, front 1987 where a state requires it; gnttype.org's 1987 option sheet confirmed
    V30 Bumper guards, front and rear 1987 standard; gnttype.org's 1987 option sheet confirmed
    WG1 Seat, power, 6 way, driver 1987 not with A65; gnttype.org's 1987 option sheet confirmed

    Internal / Process

    Code Description Years Models/Notes Confidence
    YF5 Emission system, California 1987 internal code gnttype.org's 1987 option sheet confirmed

    Sources

    Factory documents (T1)

    • [HK] chevrolet/1983-Chevrolet-Monte-Carlo.txt — cited for shared G-body powertrain codes only: 1983 dealer order guide, Monte Carlo sport coupe page (p. 30)
    • [HK] chevrolet/1984-Chevrolet-Monte-Carlo.txt — cited for shared G-body powertrain codes only: 1984 dealer order guide, Monte Carlo sport coupe page (p. 36)
    • [HK] chevrolet/1987-Chevrolet-Monte-Carlo.txt — cited for shared G-body codes only: 1987 dealer order guide LS page (p. 40), price schedule (pp. 46, 47), MVMA optional-equipment weights (pp. 87–89)
    • Not cited: the kits' alphabetical option index pages (1983 p. 28, 1984 p. 34, 1987 p. 38), which are not for ordering and date no year (rule 11(i)); the 1987 LS page's quick-spec table (item, code and x marks), which is not package contents by itself (controller ruling, 2026-11-04) but is not needed here: as in the Chevrolet Monte Carlo doc, a code whose only legible printing on the guide page is its quick-spec row is cited to a price or MVMA page of the same year that prints it on its own line and a readable model year (pp. 46, 47, 88, 89), and the Regal rows that have no such page rest on gnttype.org's 1987 option sheet; MVMA p. 90 (MX0 as MXO, UA1), because its model-year field is blank and a footer form number does not date a page; the brochure pages, which print no model year; and the SS and Aero Coupe order-guide pages (pp. 42, 44), which are Chevrolet trim pages
    • Not cited: chevrolet/1983-Chevrolet-Malibu.txt, chevrolet/1985-Chevrolet-Monte-Carlo.txt and chevrolet/1986-Chevrolet-Monte-Carlo.txt, because no Regal source dates a shared code in 1985 or 1986, and the 1983 Monte Carlo kit already covers the 1983 powertrain codes

    Other sources