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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    YG4 Factory-verified

    Chevrolet · Regular Production Option

    Seats, optional, not desired

    Years 1983–87, 1989–00 Models 10 Factory citations 55
    Query this via API →

    Also described as Seat, rear, not desiredOptional seats not desiredBody, bonus cabSeat, optional, not desired

    Also documented for GMCOldsmobile

    Documented applications

    Blazer (full-size, K5) — Square body (1983–1991)
    • 1983–1986, 1990, 1991 Factory-verified

      the kits print it as rear seat not desired, at no charge; one of AM7 or YG4 must be ordered; the C/K square-body pickup doc reads YG4 from the pickup kits as the bonus cab body code

      GM Heritage factory kit — 1983 Chevrolet Blazer, p.10.
      GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.6.
      GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.12.
      GM Heritage factory kit — 1986 Chevrolet Blazer, p.13.
      GM Heritage factory kit — 1990 Chevrolet Blazer, p.16.
      GM Heritage factory kit — 1991 Chevrolet Blazer, p.16.
    S-10 Blazer — First generation (1983–1994)
    • 1983–1987, 1989, 1991–1992, 1994 Factory-verified

      not with AM7; the merged second-generation doc writes Optional seats not desired

      GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.8.
      GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.21.
      GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.31.
      GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.17.
      GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.44.
      GM Heritage factory kit — 1989 Chevrolet Blazer, p.18.
      GM Heritage factory kit — 1991 Chevrolet S 10 Blazer, p.18.
      GM Heritage factory kit — 1992 Chevrolet S 10 Blazer, p.19.
      GM Heritage factory kit — 1994 Chevrolet S 10 Blazer, p.23.
    C/K pickup — Square body (1983–1991)
    • 1983–1987, 1991 Factory-verified

      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)

      GM Heritage factory kit — 1983 Chevrolet Truck, p.4.
      GM Heritage factory kit — 1984 Chevrolet Truck, p.4.
      GM Heritage factory kit — 1985 Chevrolet Truck, p.33.
      GM Heritage factory kit — 1986 Chevrolet Truck, p.169.
      GM Heritage factory kit — 1987 Chevrolet Truck, p.48.
      GM Heritage factory kit — 1991 Chevrolet Truck, p.64.
    Chevy Van — Second generation G-series (1983–1996)
    • 1984, 1986, 1991–1996 Factory-verified

      Sportvan rear seat not desired; from 1993 also the Chevy Van auxiliary seat not desired; the merged ck-squarebody doc reads YG4 as a pickup bonus cab.

      GM Heritage factory kit — 1984 Chevrolet G Van, p.18.
      GM Heritage factory kit — 1986 Chevrolet G Van, p.28.
      GM Heritage factory kit — 1991 Chevrolet G Van, p.21.
      GM Heritage factory kit — 1992 Chevrolet G Van, p.21.
      GM Heritage factory kit — 1993 Chevrolet G Van, p.24.
      GM Heritage factory kit — 1994 Chevrolet G Van, p.13.
      GM Heritage factory kit — 1995 Chevrolet G Van, p.14.
      GM Heritage factory kit — 1996 Chevrolet G Van, p.111.
    Suburban — GMT400 (1992–1999)
    • 1992–1998 Factory-verified
      GM Heritage factory kit — 1992 Chevrolet Suburban, p.19.
      GM Heritage factory kit — 1993 Chevrolet Suburban, p.13.
      GM Heritage factory kit — 1994 Chevrolet Suburban, p.25.
      GM Heritage factory kit — 1995 Chevrolet Suburban, p.18.
      GM Heritage factory kit — 1996 Chevrolet Suburban, p.7.
      GM Heritage factory kit — 1997 Chevrolet Suburban, p.13.
      GM factory document — 1998 chevrolet chevy suburban 2wd rpo code list, p.1.
    Suburban — Square body (1983–1991)
    • 1983, 1985–1987, 1989–1991 Factory-verified

      no charge; one of AT5, AS3 or YG4 must be ordered; printed as rear seat not desired from 1989; the C/K square-body pickup doc reads YG4 from the pickup kits as the bonus cab body code

      GM Heritage factory kit — 1983 Chevrolet Suburban, p.18.
      GM Heritage factory kit — 1985 Chevrolet Suburban, p.20.
      GM Heritage factory kit — 1986 Chevrolet Suburban, p.21.
      GM Heritage factory kit — 1987 Chevrolet Suburban, p.27.
      GM Heritage factory kit — 1989 Chevrolet Suburban, p.17.
      GM Heritage factory kit — 1990 Chevrolet Suburban, p.19.
      GM Heritage factory kit — 1991 Chevrolet Suburban, p.19.

    Related codes · mentioned in these notes

    AM7AS3AT5E63

    This page aggregates every documented appearance of YG4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.