2026 GMC Sierra 3500HD AT4

This 2026 GMC Sierra 3500HD AT4 in white delivers serious capability with a purpose-built design tailored for heavy-duty work and commanding presence on the road. - Duramax 6.6L V8 Turbodiesel engine with 470 hp and 975 lb-ft of torque - Power sunroof with automatic operation - Technology Package featuring rear camera mirror and 15 multicolor head-up display - AT4 Preferred Package with universal home remote and rear sliding power window - Gooseneck/5th wheel prep package for versatile towing setup - Black badding and sport step for refined AT4 styling - 220-amp alternator and engine block heater for reliable cold-weather performance - 20 high-gloss black aluminum wheels - Heated and ventilated leather front seats with 10-way power adjustment - Premium GMC infotainment system with SiriusXM 360L satellite radio - Multizone automatic climate control with rear heating - Advanced safety features including automatic emergency braking, lane departure warning, and rear cross-traffic alert - Bed view camera with trailer camera provisions for confident maneuvering - 4WD with 2-speed active transfer case and off-road suspension Built for those who demand more from their trucks, this Sierra 3500HD combines the rugged capability you need with the modern conveniences you expect. The Duramax diesel engine delivers substantial power and torque, making it ready for demanding jobs whether you're towing, hauling, or simply navigating challenging terrain. The 4WD system with active transfer case and off-road suspension gives you confidence in varied conditions, while features like hill descent control and exhaust brake enhance your control in demanding situations. Inside the cab, the AT4 focuses on your comfort during long days of work. Heated and ventilated front seats with premium leather trim adjust in ten different ways, ensuring you find your ideal driving position. The automatic climate control maintains comfort across multiple zones, while the power sunroof and large windows keep the cabin feeling open and connected to your