2012 GMC Sierra 3500HD SLE is a Truck (Crew Cab) model with 6-speed shiftable automatic transmission. This is a rear wheel drive model With a power of 322 HP and 380.00 ft lbs of torque. An urban consumption is . The engine has a capacity of 6.00L with V8 cylinders. To view detailed specifications like fuel consumption and dimensions, please scroll below.