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Keep going when the road ends with the 2026 GMC Sierra HD AT4 and AT4X. These trims for the heavy-duty truck focus on off-roading, taking rough terrain with ease. They allow you to relax on the way to and from the jobsite with modern amenities and convenience features.
The 2026 GMC Sierra HD AT4 and AT4X feature the Duramax 6.6L Turbo-Diesel V8 engine, which is paired with a ten-speed automatic transmission for 470 horsepower and 975 lb.-ft of torque. An exhaust brake helps you maintain control when towing a load. Tackle bigger obstacles with the AT4X, which provides 11.6 inches with an approach angle of 31.6 degrees and 25.7 degrees for the departure angle.
Design for the 2026 GMC Sierra HD AT4 and AT4X enhances your adventures, starting with stamped-steel bumpers and skid plates. Grab attention with 20-inch gloss black aluminum wheels and BFGoodrich off-road tires. Inside the cab, you can relax with 16-way power heated and ventilated front seats, which include a massage feature. An available 1.5-inch suspension lift lets you sit higher and tackle more obstacles.
Advanced technology keeps you informed and connected in the 2026 GMC Sierra HD AT4 and AT4X with the 12.3-inch diagonal color Driver Information Center. You also have the 13.4-inch diagonal premium GMC Infotainment System with voice activation. Get a complete look at what’s around the truck with up to 14 camera views, which includes te transparent trailer view.
One of the big changes for the 2026 GMC Sierra HD AT4 and AT4X trims is the addition of an EV model for the AT4. A suspension lift kit has been added along with underbody skid plates for the AEV. The AT4X has underbody protection as well.
The AT4 and AT4X trims for the 2026 GMC Sierra HD are designed to provide more exciting adventures when you go off the pavement. This truck is fun for drivers who want to explore beyond Topeka and take on rugged terrain. Take it out on the prairie or pull a load from Kansas City or St. Joseph as you experience the capability for yourself. With two rows of seats, this truck is practical for a work crew or your family.
You can see the models we have available for the latest GMC vehicles at Victory GMC St. Joseph. We’ll help you customize the 2026 GMC Sierra HD AT4 or AT4X to fit your style and needs. You can get started by filling out the online application or talk to our finance experts. We’re here to answer your questions, so contact us today to see how to make this truck yours.