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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 ...

Windows
Press the switch to lower the window. Pull the switch up to raise it. For more information, see Power Windows on page 2‑21. ...

Shifting Out of Neutral
To shift the transfer case out of N (Neutral) do the following: 1. Set the parking brake and apply the regular brake pedal. 2. Turn the ignition to ON/RUN with the engine off, and shift the transmis ...