GMT900

{{Update|date=March 2020|reason=Sections of this article are seriously (10+ years) out of date}}

{{main|List of GM platforms}}

{{Infobox automobile platform

| name = GMT900

| manufacturer = General Motors

| production = 2006–2013

| predecessor = GMT800

| successor = GMT K2XX

| layout = FR/AWD

| class = Full-size pickup truck/SUV

| body_style = 4-door SUV
4-door extended SUV
2-door pickup truck
4-door pickup truck

| similar = Ford T platform
Chrysler DR platform
Nissan ZW platform
Toyota T200 platform

| engine = 4.3 L Vortec 4300 V6
4.8 L Vortec 4800 V8
5.3 L Vortec 5300 V8
6.0 L Vortec 6000 V8
6.2 L Vortec 6200 V8

| transmission = 4-speed 4L60-E automatic
4-speed 4L65-E automatic
6-speed 6L80 automatic

| front_suspension = Coilover

| rear_suspension = 5-link live axle

| wheelbase = {{cvt|2946|mm|in|disp=flip}}

| image = Chevrolet Silverado 2500.jpg

}}

The GMT900 is a General Motors full-size pickup and SUV platform used from the 2007 to 2014 model years. The platform was introduced at the 2006 North American International Auto Show, as the replacement for the GMT800 platform. The first GMT900 vehicle introduced was the next-generation Chevrolet Tahoe.

GMT900 had been called a "Hail Mary pass" for the General Motors Corporation—the company needed the revenue from these large trucks to ensure its financial solvency. The company's resources were focused exclusively on GMT900 development through 2005, delaying other programs like the GM Zeta platform. With the 2005 spike in gasoline prices, some analysts have questioned the wisdom of "betting the company" on a line of large trucks. Sales were initially brisk, but later dropped off as the market moved to more fuel-efficient unibody vehicles.{{cite web |url=http://www.thetruthaboutcars.com/general-motors-death-watch-69-running-out-of-gas/ |title=General Motors Death Watch 69: Running Out of Gas |work=The Truth About Cars |date=April 27, 2006 |access-date=2009-06-01 |archive-date=2008-11-21 |archive-url=https://web.archive.org/web/20081121102730/http://www.thetruthaboutcars.com/general-motors-death-watch-69-running-out-of-gas/ |url-status=dead }}

The GMT900 series features standard vehicle stability control. Original plans called for American Axle's "I-Ride" independent suspension module in the rear, but was never used.

Tahoe production began at GM's Arlington Assembly plant in Arlington, Texas, on December 1, 2005, six weeks ahead of schedule.{{Cite web|last=Priddle|first=Alisa|date=January 1, 2006|title=Tahoe's Heady Mission|url=http://waw.wardsauto.com/ar/auto_tahoes_heady_mission/index.html|url-status=live|archive-url=https://web.archive.org/web/20070930015242/http://waw.wardsauto.com/ar/auto_tahoes_heady_mission/index.html|archive-date=September 30, 2007|website=Ward's AutoWorld}} Production of the SWB SUVs (Tahoe/Yukon) began at Janesville Assembly in Janesville, Wisconsin, in early January 2006. Production of long-wheelbase SUVs (Suburban/Yukon XL) began in Janesville and at Silao Assembly in Silao, Guanajuato, in March. The Avalanche was produced only in Silao, and Escalade production began in March 2006, with the ESV being produced in Arlington and the EXT being produced in Silao.{{Cite web|last=Priddle|first=Alisa|date=January 9, 2006|title=Escalade ESV, EXT Due in May|url=http://subscribers.wardsauto.com/Microsites/newsarticle.asp?newsarticleid=2756230&siteid=26&magazineid=1004&instanceid=5121&pageid=824&srid=10088|url-status=dead|archive-url=https://web.archive.org/web/20060301011733/http://subscribers.wardsauto.com/Microsites/newsarticle.asp?newsarticleid=2756230&siteid=26&magazineid=1004&instanceid=5121&pageid=824&srid=10088|archive-date=1 March 2006|website=Ward's AutoWorld}}

The SUVs began to show up at dealers in January 2006. Sales initially exceeded expectations, but by 2008, General Motors announced it was significantly cutting back production. GM has closed the SUV plant in Janesville, Wisconsin, consolidating SUV production in Arlington, Texas.

The related Silverado and Sierra pickups started production in late 2006. The Hummer H2 was meant to move to the new platform in the next few years, but has since been cancelled (although the engine and gauge cluster shape have been updated for 2008).

Due to a long-lasting downturn in sales of full-size trucks and SUVs in the United States (by as much as 30% through the first nine months of 2008), General Motors cancelled the next-generation full-size truck program in May 2008, including the replacements for the Chevrolet Tahoe and Suburban and their siblings at GMC and Cadillac.{{cite news |url=https://www.nytimes.com/2008/10/26/business/26jane.html |title=General Motors, Driven to the Brink |work=New York Times |date=October 25, 2008 |access-date=2009-06-01 |first1=Bill |last1=Vlasic |first2=Nick |last2=Bunkley |url-access=registration}} The automotive press had speculated that some GMT900 SUV models may move to the GM Lambda platform.{{cite web |date=September 9, 2008 |title=Cadillac Escalade to go Lambda |url=http://www.leftlanenews.com/cadillac-escalade-to-go-lambda.html |url-status=dead |archive-url=https://web.archive.org/web/20090915204654/http://www.leftlanenews.com/cadillac-escalade-to-go-lambda.html |archive-date=2009-09-15 |access-date=2009-06-01 |work=Left Lane News}} However, on January 14, 2010, more than six months after its bankruptcy, General Motors announced that it would resume development of full-size trucks and SUVs.http://www.detnews.com/article/20100114/BIZ/1140419/1001/biz {{dead link|date=March 2024}}