GMC Sierra All Terrain HD Toned Down From Concept To Production
 

http://images.thecarconnection.com/t...00467765_t.gif When GMC unveiled the Sierra All Terrain HD Concept back in 2011, it was a promising truck, with in-your-face styling and serious upgrades to chassis and suspension. Sized up then, it seemed ready to take on the Ford F-150 SVT Raptor. The translation from concept to reality wasn’t so kind to this truck, however, as the 2015 GMC Sierra All...

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