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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 ...

When to Change Engine Oil
This vehicle has a computer system that indicates when to change the engine oil and filter. This is based on a combination of factors which include engine revolutions, engine temperature, and mile ...

Manual Transfer Case
The transfer case shift lever is on the floor to the right of the driver. Use this lever to shift into and out of Four-Wheel Drive. A Four-Wheel Drive indicator light comes on when you shift int ...