Experience diesel-powered capability, premium comfort and rugged off-road performance in this new 2026 GMC Sierra 1500 AT4 Crew Cab Short Box 4WD. Available at MacFarlane Chevrolet Buick GMC in Petrolia, Ontario, this professional-grade full-size pickup is built for towing, hauling, demanding workdays and weekend adventures throughout Southwestern Ontario.

The VIN configuration identifies this Sierra as an AT4 Crew Cab Short Box 4WD equipped with the 3.0L Duramax Turbo-Diesel inline-six engine. Paired with a smooth 10-speed automatic transmission, the Duramax delivers strong low-end torque, responsive performance and confident trailering capability.

Built for challenging terrain, the Sierra AT4 features a 2-inch factory-installed suspension lift, off-road suspension, Rancho monotube shocks, protective skid plates and a two-speed Autotrac transfer case. Its bold exterior design, distinctive AT4 badging and red recovery hooks create a commanding road presence.

Inside, enjoy a refined Jet Black cabin with Kalahari accents, heated and ventilated front seats and a heated steering wheel. A 13.4-inch GMC infotainment touchscreen and customizable 12.3-inch digital Driver Information Centre keep compatible navigation, entertainment and vehicle information easily accessible. GMC safety and driver-assistance technologies provide added confidence on every journey.

Visit MacFarlane Chevrolet Buick GMC to explore this 2026 GMC Sierra 1500 AT4 Duramax for sale near Sarnia, Strathroy, London and throughout Lambton County.