Experience the power and capability of the 2026 GMC Sierra 3500HD AT4, a rugged 4WD crew cab truck designed for demanding work and off-road adventures.

Powered by a Duramax 6.6L Turbo-Diesel V8 engine delivering 470 horsepower and an impressive 975 lb-ft of torque, this Sierra 3500HD is built to handle heavy towing and hauling with ease. The 10-speed automatic transmission and locking limited-slip differential enhance performance and control across all terrains. Equipped with the Gooseneck/5th Wheel Prep Package, it’s ready to tow your largest trailers, featuring a hitch platform and bed-mounted 7-pin trailer harness.

The AT4 Premium Plus Package adds a power sunroof, advanced technology, and off-road high clearance steps, while dealer-installed body-colour wheel arch mouldings and black badging package provide a bold, aggressive look. Inside, enjoy premium perforated leather seats with heating and cooling, power-adjustable driver and passenger seats with lumbar support, and seat memory for personalised comfort.

Safety is comprehensive with features like blind spot monitoring, lane departure warning, front collision mitigation, and an aerial view display system. Practical touches include an integrated tailgate step, running boards, bed liner, and fold-out grab handles for added convenience. The Onyx Black exterior and Jet Black interior with Kalahari accents complete this capable, stylish truck.