Seats, center and rear

Years 1983–91, 1998–99, 2001–06, 2026–27 Models 6 Factory citations 29

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Also described as Package, Super CruiseSuper Cruise PackageBody, crew cabSeat, rear, SuburbanSeat, rear

Also documented for Cadillac Chevrolet Hummer

Documented applications

Sierra EV — BT1 (2024–2027)

2026–2027 Factory-verified

includes UKL, UKZ and ULM; requires A8H on the Elevation Extended Range; 2026: S in 4SC, 4SD, 5SB, 5SC, 5SD; A in 3SC; not offered in 3SB; 2027: S in 4SC, 4SD, 5SC, 5SD; A in 3SC; not offered in 3SB

GM factory document — 2026 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra ev fleet order guide, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide, p.1.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro, Elevation 3VL: not offered; Elevation 3SB: O; AT4, AT4X, Denali, Denali Ultimate: included in the trim group; includes UKL and ULM; the Elevation 3SB footnote also adds UQA

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.10.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, 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 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 factory kit — 1983 Chevrolet Truck, p.4.
GM Heritage factory kit — 1984 Chevrolet Truck, p.34.
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.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 gmc gmc suburban 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc suburban 2wd rpo code list, p.1.

Suburban — Square body (1983–1991)

1983–1991 Single-source

non-adjustable folding center seat with a quick release removable rear seat; includes AT5; the Chevrolet C/K square-body pickup doc reads AS3 from the pickup kits as the crew cab body code; 1988 from the seat trim price lines with AS3; 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 — 1984 Chevrolet Suburban, p.23.
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.26.
GM Heritage factory kit — 1988 Chevrolet Suburban, p.15.
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.

Yukon — GMT800 (2000–2006)

2001–2006 Factory-verified

GM factory document — 2001 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2002 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2003 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2004 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2005 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2006 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of AS3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.