2026 GMC Sierra 3500HD AT4

Experience commanding power and advanced capability with the 2026 GMC Sierra 3500HD AT4 Crew Cab, designed for rugged performance and refined comfort.

This Summit White Sierra 3500HD AT4 is equipped with a robust Duramax 6.6L Turbo-Diesel V8 engine delivering 470 horsepower and an impressive 975 lb-ft of torque, paired with a smooth 10-speed automatic transmission and a 4x4 drivetrain featuring a locking limited-slip differential. The truck’s off-road prowess is enhanced by the AT4 Premium Plus Package, which includes a power sunroof, advanced technology features, and an Off-Road High Clearance step for easier access. The Gooseneck/5th Wheel Prep Package adds versatility for heavy towing, with a dedicated hitch platform and bed-mounted 7-pin trailer harness.

Inside, the cabin offers leather bucket seats with heating and cooling functions, power adjustments with memory settings, and lumbar support for both driver and passenger. The interior is finished in sophisticated Jet Black/Kalahari tones. Safety is comprehensive with features such as Blind Spot Monitor, Front Collision Mitigation, Lane Departure Warning, and Adaptive Cruise Control. The exterior is rugged with aluminum wheels, running boards, bed liner, integrated tailgate step, and front and rear moulded splash guards, making this Sierra ready for demanding work and adventure.