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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 ...

Reading Lamps
The reading lamps are located on the overhead console. These lamps come on automatically when any door is opened. For manual operation, press the button next to each lamp to turn it on or off. ...

Removing the Spare Tire
The compact spare tire is located under the vehicle, in front of the rear bumper. See Compact Spare Tire on page 10‑77 for more information. A. Rear Convenience Center B. Wrench (Three-Piece ...