The GMC Sierra 2500 HD is a heavy-duty truck here at Johnson Auto Plaza in Brighton, CO with lots of potentials. It is powered by a 6.6L V8 gas engine with an output of 401 horsepower and 464 lb.-ft pounds of torque. The engine is paired with a six-speed shiftable automatic transmission. It also possesses a compression ratio of 10.8:1. The standard drivetrain is front-wheel drive. The Valvetrain is an overhead valve (OHV) of 2 valves per cylinder; with variable valve timing.
An optional 6.6 L V8 Turbo Diesel engine with a compression ratio of 16.0: 1 is available (paired with a 10-speed automatic transmission). This engine is capable of generating up to 445 horsepower and 910 lb.-ft of torque. A massive 28" variable-speed cooling fan was added to help in cooling this engine. An off-road suspension is also provided for off-roading duties. The truck can tow up to 18500 pounds and accommodates up to 5000 pounds of weight in the trailer. An additional automatic braking feature is available to prevent the car from rolling when parking.