The new HD 2011 he founded the Sierra all-terrain concept HD, with modified production based 4WD chassis and Duramax diesel / Allison 1000 six-speed transmission. Advanced suspension and the size of a body, including increased ground clearance and a wider track and better approach / departure angles, providing off-road capabilities while maintaining HD levels of payload and towing capacity. The All Terrain HD is painted Iridium Metallic - dark charcoal color that reveals a reddish, anodized inflection observed at certain angles.
Based on the chassis of the Sierra HD trucks in 2011, all land has a fully HD box steel frame with exceptional strength and torsional rigidity. Suspension includes new production models' independent front suspension and rear leaf spring asymmetrical but with a larger 73-inch (1853 mm) track (front and rear), which improves stability during off-road and highway driving. Sierra 2500HD has manufacturing front and rear track 68.8 in. (1748 mm) and 67.3 inches (1709 mm), respectively.
At all sites GMC Sierra HD Concept is powered by the new Duramax 6.6L turbo-diesel production combination V-8 and Allison 1000 six-speed automatic transmission power train offered in 2011 trucks Sierra HD. In the Duramax is rated at 397 hp (296 kW) and 765 Nm of torque (1037 Nm).
In the Duramax 6.6L is more powerful fuel - up to 11% higher fuel consumption compared to previous versions - and reduces NOx emissions to 63 percent. The efficiency of the propulsion system is supported by Allison Transmission 1000, which requires less engine power to funnel torque axes. It also includes a brake "smart" feature that saves the exhaust brake wear downhill grades, a feature available in production Sierra HD.