The 2025 GMC Sierra 3500 HD Chassis Cab has arrived at Dearth GMC in Monroe, bringing unparalleled power and capability to the job site. With your choice of a gas or diesel engine, this rugged workhorse is built to take on the toughest demands. The available Duramax 6.6-liter Turbo-Diesel V8 unleashes a staggering 470 horsepower and 975 pound-feet of torque, while the 6.6-liter gasoline V8 delivers an impressive 401 horsepower and 464 pound-feet of torque.