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.
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 in the US with C3500HD being produced for Mexico until 2006. 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
Basic platformModel yearsModelNotesGMT400/4801988–2000Chevrolet C/K2500 and 3500 only for 20001988–2000GMC SierraGMT4101992–1999Chevrolet SuburbanGMT4151992–1994Chevrolet Full-Size BlazerGMT4201995–2000Chevrolet TahoeGMT4251992–1999GMC SuburbanGMT4301992–2000GMC YukonGMT4351999–2000Cadillac EscaladeGMT4551992–2006Chevrolet/GMC C3500 HD2002 being the last year for US market and 2006 for Mexico market
See also GM GMT platform GMT400.com an online forum for the 88-98 body style GM trucks
References