2026 GMC Sierra 3500HD AT4

Experience commanding power and advanced capability with the 2026 GMC Sierra 3500HD AT4 in Coastal Dune, designed for those who demand strength and precision in every drive.

Powered by a Duramax 6.6L Turbo-Diesel V8 engine delivering an impressive 470 hp and 975 lb-ft of torque, this heavy-duty truck is built to handle the toughest jobs with ease. The 10-speed automatic transmission and 4x4 drivetrain, complemented by a locking limited-slip differential, ensure smooth and confident performance on and off the road. The AT4 Premium Plus Package enhances your driving experience with a power sunroof, advanced technology features, and an Off-Road High Clearance step for rugged terrain access. The Gooseneck/5th Wheel Prep Package equips the bed with a hitch platform and trailer harness, ready for heavy towing demands. Inside, enjoy heated and cooled leather bucket seats with power adjustments and memory settings, plus lumbar support for both driver and passenger, ensuring comfort on long hauls. Safety is paramount with features like Automatic Highbeams, Blind Spot Monitor, Front Collision Mitigation, Lane Departure Warning, and integrated turn signal mirrors. Exterior enhancements include body-colour wheel arch mouldings, running boards, bed liner, integrated tailgate step, and off-road tires front and rear. This Sierra 3500HD AT4 combines rugged capability with premium comfort and technology for the discerning driver.