2008 GMC Sierra 1500 Denali is a Truck (Crew Cab) model with 6-speed shiftable automatic transmission. This is a rear wheel drive model With a power of 403 HP and 417.00 ft lbs of torque. An urban consumption is 12.00 MPG. The engine has a capacity of 6.20L with V8 cylinders. To view detailed specifications like fuel consumption and dimensions, please scroll below.