The 2018 GMC Sierra 3500HD belongs to the third generation of the Sierra heavy-duty lineup. This RWD full-size pickup truck is known for its ruggedness and towing capacity. It features a 6-speed automatic transmission and 4WD is optional. The powertrain starts with a 360-hp V8, with an upgrade option to a 6.6L Duramax turbo diesel, which delivers 445 hp and an impressive 910 lb-ft of torque. Available in four trims: base, SLE, SLT and Denali, the Sierra 3500HD is well-equipped with features in its Denali range-topping trim that includes leather seating, an 8-inch infotainment system with Apple CarPlay and Android Auto, and advanced safety features including forward collision alert and lane departure warning.