GMT400

The GMT 400 and similar GMT 480 was the platform for the 1988-1998 model year Chevrolet C/K / GMC Sierra full-size pickup trucks. The GMT 410, GMT 420, GMT 425, and GMT 430 were derived for full-size SUVs, including the 1992–1994 Chevrolet Blazer and 1995–2000 Tahoe, and the GMC Yukon from 1992 to 2000.

GMT400
GMT400 GMC Sierra
Overview
Manufacturer	General Motors
Production	1986–2000
Body and chassis
Class	Full size truck
Layout	FR/4WD
Body style(s)	4-door SUV 2-door SUV 4-door extended SUV 2-door pickup truck 4-door pickup truck
Chronology
Predecessor	C/K Series
Successor	GMT800

This was the first GMT designation for the C (RWD) and K (4WD/AWD) 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 4.3L-V6, 5.0L-V8, 5.7L-V8, 7.4L-V8, and diesel 6.2L V8 and 6.5L V8. Throttle body(TBI) fuel injection was used on '88-'95 gas engines. CPI (central point injection) was used on the '96-'00 4.3L-V6, 5.0L-V8, 5.7L-V8, while the '96-'00 7.4L-V8 used SFI (sequential multiport fuel injection).

The GMT400 series was replaced by the GMT800 vehicles beginning in 1998 (for the 1999 model year). The GMT400 models were built at Ft. Wayne, IN, Pontiac, MI, Flint, MI, Arlington, TX, & Oshawa, ON Canada (pickups) and Janesville, WI & Arlington, TX (SUVs).