2011 GMC Sierra All Terrain HD Concept PictureThe new 2011 Sierra HD underpins the All Terrain HD concept, with a modified, production-based 4WD anatomy and the Duramax diesel/Allison 1000 six-speed powertrain. The added abeyance and different anatomy dimensions, including added arena approval and added track, as able-bodied as greater approach/departure angles, bear off-road adequacy while advancement HD levels of burden and trailering capacity.
"The Sierra All Terrain HD abstraction takes GMC's outstanding new HD belvedere to the abutting level, marries it to the allegorical Duramax diesel/Allison transmission, and provides a able announcement of GMC's aberrant All Terrain package," said Lisa Hutchinson, GMC artefact business director. "It delivers the aberrant capabilities of the Sierra HD - hauling, towing and achievement - and applies them to the toughest active environments. It's the ultimate professional-grade apparatus for architecture crews, ranchers and adventurers whose activities aren't bound by area the pavement ends."
The GMC Sierra All Terrain HD appearance a different five-foot, eight-inch Crew Cab/short box anatomy agreement that supports a wheels-at-the-corners proportion. Shorter in all-embracing breadth than assembly Sierra HD models, the concept's ambit accord to greater approach/departure angles. Additional off-road elements include:
- Wider, 73-inch (1,853 mm) track for greater stability
- Approximately 3 inches (76 mm) greater ground clearance
- Custom front upper and lower control arms
- Specially constructed Fox off-road shocks with remote fluid reservoirs (integrated in the wheel house liners)
- Front and rear jounce shocks
- Electronic front stabilizer bar disconnection
- 35-inch-tall BFGoodrich KM2 "mud terrain" tires mounted on 20-inch machined aluminum wheels
- Full composite underbody protection.
