2026 GMC Sierra 3500HD AT4

Experience the 2026 GMC Sierra 3500HD AT4 Crew Cab 4WD in striking Onyx Black, engineered for power, capability, and advanced technology tailored to demanding drivers.

Powered by a Duramax 6.6L Turbo-Diesel V8 engine delivering 470 hp and an impressive 975 lb-ft of torque, this heavy-duty truck is built to handle the toughest tasks with ease. The 10-speed automatic transmission and four-wheel drive system, complemented by a locking limited-slip differential, provide confident control on any terrain. The Gooseneck/5th Wheel Prep Package equips the Sierra 3500HD for serious towing needs, featuring a hitch platform and bed-mounted 7-pin trailer harness.

Step into premium comfort with heated and cooled leather bucket seats, power-adjustable driver and passenger seats with lumbar support, and seat memory for personalized settings. The AT4 Premium Plus Package adds a power sunroof, off-road high clearance steps with LED lighting, and a suite of technology including a 13.4" diagonal premium infotainment system with Google built-in apps. The Technology Package enhances safety and convenience with a rear camera mirror and a multicolour 15" diagonal head-up display.

Safety is comprehensive with automatic high beams, blind spot monitoring, cross-traffic alert, lane departure warning, front collision mitigation, and multiple airbags. Exterior features like body-colour wheel arch mouldings, black badging package, integrated tailgate step, running boards, and power-retractable assist steps combine rugged style with functionality. This Sierra 3500HD AT4 is ready to tackle work and adventure with confidence and sophistication.