GMC Sierra 2500Hd 2026

The 2026 GMC Sierra 2500HD AT4 is a heavy-duty pickup built for drivers who need exceptional capability, premium comfort, and serious off-road performance. Powered by a Duramax 6.6L Turbo-Diesel V8 paired with the Allison 10-speed automatic transmission, the AT4 delivers impressive towing, hauling, and confidence on demanding terrain. Its factory-installed off-road suspension, Rancho monotube shocks, skid plates, hill descent control, and standard four-wheel drive make it ready for challenging trails and tough job sites alike. Inside, the Sierra 2500HD AT4 offers a refined cabin with premium materials, a large GMC infotainment touchscreen featuring wireless Apple CarPlay and Android Auto, and advanced driver-assistance technologies for added confidence behind the wheel. When you’re ready to really put it to work, a gooseneck/5th wheel prep package, as well as a Universal Vehicle Module come installed and ready to go. Combining rugged capability, advanced technology, and bold AT4 styling, the 2026 GMC Sierra 2500HD AT4 is an ideal choice for work, adventure, and everything in between.