The GMT 400 and similar GMT 480 was the platform used for the Chevrolet C/K and GMC Sierra full-size pickup trucks beginning with the 1988 model year. The GMT 410, GMT 420, GMT 425, and GMT 430 variants were derived for full-size SUVs, including the 1992–1994 Chevrolet Blazer and 1995–2000 Tahoe, and the GMC Yukon from late 1991 to 2000.

GMT400
GMT400 GMC Sierra
Overview
ManufacturerGeneral Motors
Production1988–2002
Body and chassis
ClassFull-size truck
LayoutFR/4WD
Body style(s)4-door SUV
2-door SUV
4-door extended SUV
2-door pickup truck
4-door pickup truck
Chronology
PredecessorC/K Series
SuccessorGMT800

This was the first GMT designation for the C (RWD) and K (4WD/AWD) series full-size trucks and SUVs.

The engineering for the GMT400 was done by the GM Truck & Bus group, working primarily out of a rented facility at Pioneer Engineering on 9 mile Road in Warren, MI.

GMT 400 frames were built by A.O. Smith Automotive Products, Dana Holding Corporation, and Tower Automotive.

Engines included the gasoline 4.3 L V6, 5.0 L V8, 5.7 L V8, 7.4 L V8, and diesel 6.2 L and 6.5 L V8s. Throttle-body injection (TBI) was used on gas engines through 1995. Central point injection (CPI) was used on the 1996–2000 4.3 L, 5.0 L, and 5.7 L engines, while the 1996–2000 7.4 L V8 used sequential fuel injection (SFI).

The GMT400 series was replaced by the GMT800 vehicles beginning in 1998 (for the 1999 model year). The GMT400 remained in production, with the lineup slowly pared down until the last models were discontinued in 2002. The GMT400 truck models were built at Ft. Wayne, Indiana; Pontiac, Michigan; Flint, Michigan; Oshawa, Ontario, Canada; and SUVs at Janesville, Wisconsin and Arlington, Texas.

Applications

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Basic platform Model years Model Notes
GMT400/480 1988–2000 Chevrolet C/K 2500 and 3500 only for 2000
1988–2000 GMC Sierra
GMT410 1992–1999 Chevrolet Suburban
GMT415 1992–1994 Chevrolet Full-Size Blazer
GMT420 1995–2000 Chevrolet Tahoe
GMT425 1992–1999 GMC Suburban
GMT430 1992–2000 GMC Yukon
GMT435 1999–2000 Cadillac Escalade
GMT455 1992–2002 Chevrolet/GMC C3500 HD

See also

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