Meet the 2025 GMC Sierra 3500HD AT4, a powerful diesel truck engineered for those who demand capability and confidence on any road or job site. Duramax 6.6L V8 Turbodiesel engine with 10-speed automatic transmission 4WD with 2-speed active transfer case and off-road suspension X31 Off-Road Package with hill descent control Bose Premium 7-Speaker Sound System with Sirius XM 360L GMC Premium 13.4" diagonal information display with wireless phone projection HD Surround Vision with bed view camera and trailer camera provisions Heated and ventilated leather front seats with 10-way power adjustments Heated steering wheel and heated rear seats Automatic emergency braking with forward collision alert and lane departure warning Ultrasonic front and rear park assist with rear cross traffic alert Spray-on pickup bedliner with GMC logo 20" high-gloss black aluminum wheels Wireless charging and dual USB charging ports The AT4 trim reflects GMC's commitment to serious truck capability. Its Duramax turbodiesel engine partners with a robust 10-speed automatic transmission and full-time 4WD, delivering the torque and traction you need whether you're hauling a trailer across state lines or navigating challenging terrain. The 2-speed active transfer case and off-road-tuned suspension, enhanced by the X31 Off-Road Package, mean you're ready for whatever conditions arise. Inside, the cabin prioritizes both comfort and connectivity. Premium leather seating with heating and ventilation functions keeps you comfortable during long drives, while the heated steering wheel provides additional convenience in cold weather. The 13.4-inch GMC Premium information display serves as your command center, offering wireless phone projection and integration with premium audio. That Bose 7-speaker system transforms every drive into a quality listening experience. Safety and visibility have been thoroughly addressed. The HD Surround Vision system, bed view camera with trailer provisions, and automatic emergency braking give you confidence in every maneuver. Ultrasonic park assist, rear cross traffic alert, and trailer side blind zone alert technology work together to keep you informed and protected. Forward collision alert and lane departure warning add layers of awareness during highway travel. Practical features make daily ownership seamless. The spray-on bedliner provides lasting protection, while 120-volt power outlets in both the bed and instrument panel keep your equipment charged. Wireless charging and multiple USB ports ensure your devices stay ready to go. Premium floor liners protect the cabin, and the split-folding rear seat adapts to your cargo needs. This 2025 Sierra 3500HD AT4 represents serious capability wrapped in refined execution. The black exterior finish commands presence, while the 20-inch high-gloss black aluminum wheels complete the commanding stance. Whether your priorities center on work performance, towing reliability, or the confidence that comes from genuine off-road sophistication, this truck delivers. We invite you to visit our showroom and connect with this truck firsthand. Experience how its combination of turbodiesel power, advanced technology, and purposeful design translates to real-world capability. Our team is ready to discuss how the Sierra 3500HD AT4 can serve your needs.