The GMT800 was the basis for the previous generation Chevrolet Silverado

Chevrolet Silverado

The Chevrolet Silverado , is the latest line of full-size pickup trucks from General Motors.-History:...

 full-size pickup truck. The derived GMT820 and GMT830 was used in the Suburban

Chevrolet Suburban

Chevrolet offered a station wagon body, built on the 1/2 ton truck frame. This model was specifically built for National Guard units and Civilian Conservation Corps units. Much of the body was constructed from wood, and could seat up to eight occupants....

, among other full-size SUVs. This was the successor to the GMT400

GMT400

The GMT 400 and similar GMT 480 is the platform for the 1988-1998 full-size pickup truck platform. The GMT 410, GMT 420, GMT 425, and GMT 430 were used for full-size SUVs from 1991 to 2000. This was the first GMT designation for the C and K full-size trucks and SUV's.GMT 400 frames were built by...

 series of C/K pickups and SUVs, and was replaced for 2007 by the GMT900

GMT900

The GMT900 truck platform debuted at the 2006 North American International Auto Show, as basis for the next generation of General Motors full-size pickups and SUVs, and replacements for the GMT800 vehicles...

 line.

The GMT 800 platform was introduced in 1999. Frames were manufactured by Magna International

Magna International

Magna International Inc. , is an automotive supplier headquartered in Aurora, Ontario, Canada. It is Canada's largest automobile parts manufacturer, and one of the country's largest companies. It owns the Magna Steyr automobile production company of Austria....

 in Ramos Arizpe

Ramos Arizpe

Ramos Arizpe is a city and seat of the surrounding municipality of the same name in the Mexican state of Coahuila. Ramos Arizpe is located 11 km from the state capital of Saltillo. It is part of the Saltillo metropolitan area. The city reported a population of 48,228 in the 2005 census; the...

, Coahuila

Coahuila

Coahuila, formally Coahuila de Zaragoza , officially Estado Libre y Soberano de Coahuila de Zaragoza is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico...

, Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 and St. Thomas, Ontario

St. Thomas, Ontario

St. Thomas is a city in southern , Ontario, Canada. It is the seat for Elgin County and gained its city charter on March 4, 1881.-History:...

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. Final assembly is in Oshawa, Ontario

Oshawa, Ontario

Oshawa is a city in Ontario, Canada, on the Lake Ontario shoreline. It lies in Southern Ontario approximately 60 kilometres east of downtown Toronto. It is commonly viewed as the eastern anchor of both the Greater Toronto Area and the Golden Horseshoe. It is now commonly referred to as the most...

, Pontiac, Michigan

Pontiac, Michigan

Pontiac is a city in the U.S. state of Michigan named after the Ottawa Chief Pontiac, located within the Detroit metropolitan area. As of the 2010 census, the city had a total population of 59,515. It is the county seat of Oakland County...

, and Fort Wayne, Indiana

Fort Wayne, Indiana

Fort Wayne is a city in the US state of Indiana and the county seat of Allen County. The population was 253,691 at the 2010 Census making it the 74th largest city in the United States and the second largest in Indiana...

. The GMT820-based Hummer H2

Hummer H2

The Hummer H2 is an SUV and SUT that was marketed by General Motors under the Hummer brand. It is a large truck , while longer, heavier , and taller with room for six passengers , seven passengers in some models. The rearmost part of the H2 SUV was modified to a pickup truck bed for the 2005 H2 SUT...

 was built under contract by AM General

AM General

AM General is an American heavy vehicle manufacturer based in South Bend, Indiana. It is best known for the civilian Hummer and the military Humvee, that is assembled in Mishawaka, Indiana...

 at a specially-constructed plant in Mishawaka, Indiana

Mishawaka, Indiana

Mishawaka is a city on the St. Joseph River and a Twin city of South Bend in St. Joseph County, Indiana, United States. The population was 48,252 as of the 2010 Census...

, USA

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

.

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.

Sales

Year	2001	2002	2003	2004	2005
Total sales	1,569,198	1,672,804	1,810,340	1,704,239	1,491,084

Applications

Basic platform	Years	Model	Notes
GMT800/880	1999–2006	Chevrolet Silverado Chevrolet Silverado The Chevrolet Silverado , is the latest line of full-size pickup trucks from General Motors.-History:...
	1999–2006	GMC Sierra
GMT820	2002–2006	Cadillac Escalade Cadillac Escalade The Cadillac Escalade is a full-size luxury sport utility vehicle sold by the General Motors luxury brand, Cadillac. It was the division's first major entry into the popular SUV market. The Escalade was introduced for the 1999 model year in response to German and Japanese competitors and to Ford's...
	2000–2006	Chevrolet Tahoe Chevrolet Tahoe The Chevrolet Tahoe are full-size SUVs from General Motors. Chevrolet and GMC sold two different-sized SUVs under their Blazer/Jimmy model names through the early 1990s. This situation changed when GMC rebadged the full-size Jimmy as the Yukon in 1992...
	2000–2006	GMC Yukon Chevrolet Tahoe The Chevrolet Tahoe are full-size SUVs from General Motors. Chevrolet and GMC sold two different-sized SUVs under their Blazer/Jimmy model names through the early 1990s. This situation changed when GMC rebadged the full-size Jimmy as the Yukon in 1992...
	2003–2009	Hummer H2 Hummer H2 The Hummer H2 is an SUV and SUT that was marketed by General Motors under the Hummer brand. It is a large truck , while longer, heavier , and taller with room for six passengers , seven passengers in some models. The rearmost part of the H2 SUV was modified to a pickup truck bed for the 2005 H2 SUT...	A unique platform, the front used a modified utility frame, the mid-section was all new and completely boxed. The rear section used an upgraded frame for the 8,600 pounds gross vehicle weight.
GMT830		Cadillac Escalade ESV
		Chevrolet Suburban Chevrolet Suburban Chevrolet offered a station wagon body, built on the 1/2 ton truck frame. This model was specifically built for National Guard units and Civilian Conservation Corps units. Much of the body was constructed from wood, and could seat up to eight occupants....
		GMC Yukon XL Chevrolet Suburban Chevrolet offered a station wagon body, built on the 1/2 ton truck frame. This model was specifically built for National Guard units and Civilian Conservation Corps units. Much of the body was constructed from wood, and could seat up to eight occupants....
GMT805		Chevrolet Avalanche Chevrolet Avalanche The Chevrolet Avalanche is a four-door, five or six passenger sport utility truck sharing GM's long-wheelbase chassis used on the Chevrolet Suburban and Cadillac Escalade EXT. Unlike the typical pickup truck, the open bed of the Avalanche opens to the back seat area through a folding panel and a...
GMT806		Cadillac Escalade EXT