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GMC Sierra All Terrain HD Concept at Detroit 2011

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Published on Jan 13, 2011

Complete photo gallery on Auto123.com : http://123.ly/fY0BgF - With several world premieres and unveilings, the Detroit Auto Show gave us the opportunity to take a look at the the GMC Sierra All Terrain HD Concept.

The super sized truck will be the Ford SVT Raptor's closest competitor and comes equipped with the new 6.6-litre Duramax Diesel engine producing 397 horsepower and 765 pound-feet of torque mated to an Allison 1000 six-speed automatic transmission.

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