While the Detroit Auto Show is just a few weeks away, General Motors has decided to offer us a few hints on what the company will be offering, and the first details revealed are on the GMC Sierra All Terrain HD Concept.
Based on the Sierra HD, the Sierra All Terrain HD concept is shorter, wider, and taller than the original. It features a unique five-foot, eight-inch Crew Cab/short box body configuration that supports a wheels-at-the-corners proportion. Its exterior design is accentuated by a large, airflow-optimized grille, streamlined bumpers, large fender flares, LED lights, smooth-appearance front marker lamps integrated behind the top edge of the windshield glass, and 20-inch aluminum wheels wrapped in 35-inch-tall BFGoodrich tires.
Under the hood GMC has placed a 6.6L Duramax turbo-diesel V-8 engine that delivers a total of 397 HP and 765 lb.-ft. of torque. The engine is mated to an Allison 1000 six-speed automatic transmission.
UPDATE 01/06/2011: News images for the 2011 GMC Sierra All Terrain HD concept have been revealed. These images feature more shots of the exterior and even a couple highlighting the interior of GM’s modified heavy duty truck. Check them out in the gallery provided!
Press release after the jump.
GMC Sierra All Terrain HD Concept originally appeared on topspeed.com on Thursday, 6 January 2011 13:00 EST.
Source: http://www.topspeed.com/cars/gmc/2011-gmc-sierra-all-terrain-hd-concept-ar101949.html
Osmo Hansen Gregg Hansford Tetsuya Harada John Hartle Wil Hartog Gary Haslam

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