New 2026 GMC Sierra 3500HD

Experience unmatched capability and advanced technology in the 2026 GMC Sierra 3500HD AT4 Crew Cab Diesel 4x4, designed for demanding work and rugged off-road performance.

Powered by a Duramax 6.6L Turbo-Diesel V8 engine delivering 470 horsepower and an impressive 975 lb-ft of torque, this heavy-duty truck features a 10-speed automatic transmission and a locking limited-slip differential for superior traction. The AT4 Premium Plus Package enhances your drive with a power sunroof, advanced Technology Package, and Off-Road High Clearance steps. The crew cab comfortably seats five with heated and cooled leather bucket seats, including driver and passenger adjustable lumbar support and memory settings.

Safety is comprehensive with automatic high beams, blind spot monitoring, cross-traffic alert, front collision mitigation and warning, lane departure warning, and multiple airbags. The trailer-ready Gooseneck/5th Wheel Prep Package includes a hitch platform, stamped bed holes, and a 7-pin trailer harness, while trailer tire pressure monitor sensors keep you informed on the road. Practical exterior features include a bed liner, integrated tailgate step, running boards, off-road tires, and front and rear moulded splash guards. The aerial view display system, adaptive cruise control, heated steering wheel, and remote engine start round out a truck built for tough jobs and confident towing.