GMT800

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The GMT800 was the platform for the 1999 - 2006 Chevrolet and GMC full-size trucks. The derived GMT820 and GMT830 was used in the Chevrolet Tahoe, Chevrolet Suburban, and the GMC Yukon and Yukon XL full-size SUVs. This was the successor to the GMT400 series of C/K pickups and SUVs, and was replaced for 2007 by the GMT900 line.

The GMT 800 platform was introduced in 1999. Frames were manufactured by Magna International in Ramos Arizpe, Coahuila, Mexico and St. Thomas, Ontario, Canada. Final assembly was in Oshawa, Ontario; Pontiac, Michigan; Fort Wayne, Indiana; and Flint, Michigan; for pickup & chassis cab models, and Silao, Mexico; Janesville, Wisconsin; and Arlington, Texas; for SUV models. The GMT820-based Hummer H2 was built under contract by AM General at a specially-constructed plant in Mishawaka, Indiana. A GMT810 2 door SUV variant was designed and prototyped, but was not put into production.

The GMT800 introduced a three section frame system, which could be mixed and matched depending on the wheelbase, GVWR, and body type fitted to the platform, rather than a single piece long frame. The front section was hydroformed. The middle and rear sections were roll formed or stamped, depending on application. This gives greater flexibility to the platform. A total of four front modules, seven midsections, and four rear sections were created to mix and match for nearly 40 different truck configurations.

The GMT800 was the first truck usage of the all-new GM Gen III V-8 engines. The 4.8 and 5.3L versions featured iron blocks and aluminum heads, while the 6.0L version used iron in both the block and heads.