Seats, optional, not desired

Years 1983–87, 1989–91, 1998–00 Models 10 Factory citations 33

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Also described as Optional seats not desiredSeat, rear, not desiredBody, bonus cabSeat, optional, not desired

Also documented for Chevrolet Oldsmobile

Documented applications

Jimmy (full-size) — Square body (1983–1991)

1983–1986, 1990, 1991 Single-source

the kits print it as rear seat not desired, at no charge; one of AM7 or YG4 must be ordered; the GMC GMT400 Yukon doc reads YG4 with the same wording from GM's lists; shared square-body platform code; cited from the Chevrolet Blazer kit; 1991 rests on the Chevrolet-only 1991 Blazer book, so the row is single-source

GM Heritage factory kit — 1983 Chevrolet Blazer, p.10.
GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.19.
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.

Jimmy — second generation (1995–2001)

1998–2000 Factory-verified

GM factory document — 1998 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 1999 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2000 gmc jimmy 4wd rpo code list, p.1.

Jimmy — first generation (1983–1994)

1983, 1987, 1989 Factory-verified

not with AM7; shared S/T platform code; cited from the joint S-10/15 Blazer/Jimmy pages of the S-10 Blazer kit

GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.8.
GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.44.
GM Heritage factory kit — 1989 Chevrolet Blazer, p.18.

Sierra — GMT400 (1988–2000)

1998 Factory-verified

GM factory document — 1998 gmc gmc c pickup 2wd rpo code list, p.1.

Sierra — Square body (1983–1991)

1983–1987, 1991 Single-source

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 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.

Sonoma — second generation (1994–2004)

1998–2000 Factory-verified

GM factory document — 1998 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 1999 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2000 gmc sonoma pickup 4wd rpo code list, p.1.

Suburban — GMT400 (1992–1999)

1998 Factory-verified

GM factory document — 1998 gmc gmc suburban 2wd rpo code list, p.1.

Suburban — Square body (1983–1991)

1983, 1985–1987, 1989–1991 Single-source

no charge; one of AT5, AS3 or YG4 must be ordered; printed as rear seat not desired from 1989; the Chevrolet C/K square-body pickup doc reads YG4 from the pickup kits as the bonus cab body code; shared square-body platform code; cited from the Chevrolet Suburban kit; 1991 rests on the Chevrolet-only 1991 Suburban book, so the row is single-source

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.

Vandura and Rally — Second generation G-series (1983–1996)

1984, 1986 Factory-verified

passenger van rear seat not desired; shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1984 Chevrolet G Van, p.18.
GM Heritage factory kit — 1986 Chevrolet G Van, p.28.

Yukon — GMT400 (1992–1999)

1998 Factory-verified

GM factory document — 1998 gmc yukon 2wd rpo code list, p.1.

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