The new 2011 GMC Sierra All Terrain HD Concept, with a changed, production-based four wheel drive chassis and therefore the Duramax diesel/Allison a thousand six-speed powertrain. the improved suspension and distinctive body dimensions, together with increased ground clearance and wider track, in addition as larger approach/departure angles, deliver off-road capability whereas maintaining HD levels of payload and trailering capability. The All Terrain HD is painted Iridium Metallic – a dark charcoal color that reveals a reddish, anodized inflection when viewed from sure angles.

The 2011 GMC Sierra All Terrain HD Concept options a completely boxed steel frame with exceptional strength and torsional stiffness. It incorporates the assembly models’ new freelance front suspension and asymmetrical rear leaf-spring suspensions, however with a wider 73-inch (1,853 mm) track (front and rear) that enhances stability throughout off-road and highway driving. A production Sierra 2500HD has front and rear tracks of 68.8 inches (1,748 mm) and 67.3 inches (1,709 mm), respectively.

The 2011 GMC Sierra All Terrain HD Concept is propelled by the new, production 2.6L Duramax turbo-diesel V-8 and Allison a thousand six-speed automatic transmission powertrain combination offered within the 2011 Sierra HD trucks. The Duramax is rated at 397 horsepower (296 kW) and 765 lb.-ft. of torque (1,037 Nm).

The powerful 2.6L Duramax is additional fuel-efficient – with up to 11-percent larger fuel economy than previous versions – and reduces NOx emissions by up to 63 %. The powertrain’s potency is assisted by the Allison a thousand transmission, which needs less engine power to funnel torque to the axles. It conjointly incorporates a “smart” exhaust brake feature that helps save wear on the brakes on downhill grades, a feature on the market on production Sierra HDs.