Experience the 2026 GMC Sierra 3500HD AT4: Built for Power, Precision, and Comfort, Perfect for the Canadian Driver Who Demands More from Every Journey.

The 2026 GMC Sierra 3500HD AT4 is a powerhouse designed for those who require more than just transportation. With its formidable L5P 6.6L Turbo-Diesel V8 engine, delivering an impressive 470 horsepower and 975 lb-ft of torque, this truck is ready to tackle any terrain or heavy-duty task with ease. The AT4 Premium Plus Package enhances your driving experience with a power sunroof and advanced technology, including a multicolour 15" diagonal head-up display and rear camera mirror. The off-road high clearance step and body colour wheel arch mouldings add a rugged yet refined touch to its exterior. Inside, enjoy the luxury of leather seats with heating and cooling options, ensuring comfort in all weather conditions. The 13.4" diagonal premium GMC infotainment system, featuring Google built-in apps, wireless Android Auto, and Apple CarPlay, keeps you connected and entertained on the go. Safety is paramount with features like blind spot monitoring, lane departure warning, and front collision mitigation. Whether you're towing with the gooseneck/5th wheel prep package or cruising through the city, the Sierra 3500HD AT4 is your ultimate companion.