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

The VIN configuration identifies this Sierra as an AT4 4WD powered by the 3.0L Duramax Turbo-Diesel inline-six engine. Paired with a smooth 10-speed automatic transmission, the Duramax delivers 495 lb.-ft. of standard torque for confident acceleration, trailering and low-speed control.

The Sierra AT4 is engineered for challenging terrain with a 2-inch factory-installed suspension lift, off-road suspension, Rancho monotube shocks, a two-speed Autotrac transfer case and protective underbody skid plates. Bold AT4 styling includes black chrome grille details, Gloss Black accents and distinctive red recovery hooks.

Inside, enjoy heated and ventilated perforated leather front seats in Jet Black with Kalahari accents. A 13.4-inch GMC infotainment touchscreen, 12.3-inch digital Driver Information Centre, Google built-in compatibility and wireless smartphone connectivity help keep information and entertainment easily accessible.

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