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Powertrain details
The GMC Sierra All Terrain HD concept is propelled by the new, production 6.6L Duramax turbo-diesel V-8 and Allison 1000 six-speed automatic transmission powertrain combination offered in the 2011 ...

Headlamps, Front Turn Signal, Sidemarker, and Parking Lamps
A. Side Marker Lamp B. Low-Beam Headlamp C. High-Beam Headlamp D. Park/Turn Signal Lamp 1. Open the hood. See Hood on page 10‑5 2. If you are replacing the bulb on the passenger side, remo ...

Rear Climate Control System (Rear Climate Control Only)
A. Fan Control B. Temperature Control C. Air Delivery Mode Control For vehicles with the rear climate control system, the controls are located on the rear of the center console. The system can al ...