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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 ...

Blizzard Conditions
Being stuck in snow can be a serious situation. Stay with the vehicle unless there is help nearby. If possible, use the Roadside Assistance Program (U.S. and Canada) on page 13‑8 or Roadside As ...

Using the Radio to Control a USB Storage Device or iPod
The radio can control a USB storage device or an iPod using the radio buttons and knobs and display song information on the radio’s display. (Tune): Turn to select files. SEEK: Press to go to th ...