It looks like GMC has set their sights on dethroning the Ford Raptor as the ultimate off-road truck. The GMC Sierra All Terrain HD doesn't really have a name that rolls off the tongue quite as readily as the Raptor, but it certainly isn't lacking in capability. GMC took a different route with the engine than that of its rival, going for a 6.6-liter V8 Duramax diesel engine.That means horsepower is slightly lower than the Raptor's, at 397.
Torque, on the other hand is a staggering 765 ft-lbs. Quite a good number to have when going off road. Also good to have will be the 110-volt outlet and the air compressor which come standard.