New 2026 GMC Sierra 2500HD

Experience commanding power and advanced capability with the 2026 GMC Sierra 2500HD AT4 Crew Cab in striking Onyx Black, built for demanding work and rugged adventures.

Powered by a robust 6.6L V8 gasoline engine delivering 401 horsepower and 464 lb-ft of torque, paired with a smooth 10-speed automatic transmission and four-wheel drive, this Sierra 2500HD handles heavy towing and challenging terrain with confidence. The Gooseneck/5th Wheel Prep Package equips the truck with a hitch platform, stamped bed holes, and a bed-mounted 7-pin trailer harness, making it ready for serious hauling tasks.

Inside, enjoy premium comfort with leather bucket seats featuring heating and cooling, power adjustments with memory settings, and adjustable lumbar support for both driver and passenger. The AT4 Preferred Package adds convenience with a rear sliding power window, roof marker lamps, and a universal home remote. Safety is comprehensive, including blind spot monitoring, front collision mitigation, lane departure warning, and adaptive cruise control. The truck also offers an aerial view display system and a back-up camera for enhanced awareness.

Exterior features like a bed liner, integrated tailgate step, running boards, and aluminum wheels combine durability and functionality, while heated mirrors and fog lamps improve visibility in all conditions. The 2026 Sierra 2500HD AT4 is engineered to meet the needs of drivers who demand strength, comfort, and advanced technology on every journey.