2021 GMC Sierra 1500 AT4 is a Truck (Crew Cab) model with 10-speed shiftable automatic transmission. This is a four wheel drive model With a power of 355 HP and 383.00 ft lbs of torque. An urban consumption is 16.00 MPG. The engine has a capacity of 5.30L with V8 cylinders. To view detailed specifications like fuel consumption and dimensions, please scroll below.