Offered in Regular Cab, Extended Cab and Crew Cab configurations, and a wide selection of trim levels and option groups, the Sierra 1500 is available with either a V6 or one of two V8 engines, with output ranging from 285 to 420 horsepower. And let's not forget the luxurious Sierra Denali edition. For 2017, the Sierra 1500 can now tow up to 12,500 lbs. The 6.6-litre, turbodiesel V8 in the Sierra HD now develops 445 hp and 910 lb.-ft. of torque.