This particular Sierra AT4 is a 2500HD version with a big turbodiesel V8 boasting an impressive 975 lb-ft of torque. It's also well-equipped with the Preferred, Technology, and Gooseneck/5th Wheel packages, and it features some nice upgrades like 22-inch Hostile wheels, a Cognito Motorsports leveling kit, Elka Suspension reservoir shocks, and a BAKFlip bed cover. Power comes from a 6.6-liter turbodiesel V8 engine, rated at 470 horsepower and 975 lb-ft of torque. Output is sent to the rear or all four wheels via an Allison 10-speed automatic transmission.