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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 ...

Power Reclining Seatbacks
To adjust a power seatback, if available: ○ Tilt the top of the control rearward to recline. ○ Tilt the top of the control forward to raise. ...

High Voltage Devices and Wiring
WARNING Exposure to high voltage can cause shock, burns, and even death. The high voltage components in the vehicle can only be serviced by technicians with special training. High voltage components ...