Experience unmatched capability and comfort with the 2026 GMC Sierra 3500HD AT4, featuring a powerful Duramax 6.6L Turbo-Diesel V8 engine and advanced off-road technology.

This new Sierra 3500HD AT4 in Titanium Rush Metallic is built for drivers who demand strength and sophistication. Powered by a 470 hp Duramax 6.6L Turbo-Diesel V8 engine delivering 975 lb-ft of torque, paired with a 10-speed automatic transmission and 4x4 drivetrain, it offers exceptional towing and hauling performance. The Gooseneck/5th Wheel Prep Package provides a hitch platform ready for heavy-duty towing needs, including a bed-mounted 7-pin trailer harness.

Designed for comfort and convenience, the crew cab seats five with leather bucket seats featuring heating, cooling, and adjustable lumbar support for both driver and passenger. The AT4 Premium Plus Package adds a power sunroof, advanced technology features, and off-road high clearance steps, enhancing both style and functionality. Safety is prioritized with features like Automatic Highbeams, Blind Spot Monitor, Cross-Traffic Alert, Front Collision Mitigation, Lane Departure Warning, and multiple airbags.

Additional rugged touches include running boards, integrated tailgate step, bed liner, front and rear moulded splash guards, and a fold-out bed-mounted assist handle. Aluminum wheels and off-road tires complete this capable and refined truck, ready to tackle any challenge.