The 2025 GMC Sierra 2500 HD delivers the unrivaled performance you need for any job around Vernon, CT. A potent 6.6-liter turbodiesel V8 engine produces a best-in-class 470 horsepower and 975 pound-feet of stump-pulling torque. This powerplant pairs with a smooth-shifting 10-speed Allison automatic transmission, optimized for heavy-duty applications to put all that power to the ground. 4-wheel drive (4WD) with an auto-locking rear differential provides confidence-inspiring traction even in the most challenging conditions.
Take your Sierra 2500 HD's performance to the next level with available upgrades like 18-inch machined aluminum wheels, Rancho twin-tube shocks, underbody skid plates, and a heavy-duty trailering package. The AT4X trim boasts an advanced suspension, front and rear e-locking differentials, and massive 35-inch Goodyear Wrangler DuraTrac mud terrain tires for the ultimate off-road capability. Explore the performance features of the new GMC Sierra 2500 HD at Scranton GMC of Vernon, your local Connecticut GMC truck headquarters.