Meet the 2026 GMC Sierra 3500HD AT4, a heavy-duty truck engineered to handle demanding work and off-road adventures with confidence and capability.
- Duramax 6.6L V8 Turbodiesel engine with 10-speed automatic transmission
- 4WD with 2-speed active transfer case and off-road suspension
- AT4 Preferred Package with X31 Off-Road Package
- Gooseneck/5th wheel prep package for serious towing and hauling
- HD Surround Vision with bed view camera and trailer camera provisions
- Bose premium 7-speaker sound system with SiriusXM 360L trial subscription
- Navigation system with wireless phone projection
- Heated and ventilated front seats with heated rear outboard seats
- Premium leather seat trim with 10-way power adjusters and lumbar support
- Ultrasonic front and rear park assist with rear cross traffic alert
- Trailer side blind zone alert and side-mounted blind zone alert
- Remote vehicle starter system with push button start and keyless entry
- Spray-on bedliner with GMC logo and LED cargo area lighting
- 20-inch high gloss black aluminum wheels
- Wireless charging and multiple USB charging ports throughout
This Sierra 3500HD combines rugged capability with refined comfort. The Duramax diesel engine delivers the power you need for heavy work, while the 4WD system and off-road suspension tackle challenging terrain. The gooseneck and fifth-wheel prep package positions this truck for serious towing applications, and the trailer-specific camera systems provide visibility when maneuvering in tight spaces.
Inside, the AT4 prioritizes both functionality and comfort. Premium leather seating with heated and ventilated front seats keeps you comfortable during long drives, while the navigation system and premium Bose audio system make every mile more enjoyable. The wireless charging pad and multiple USB ports keep your devices powered throughout the day.
Safety and driver assistance features are comprehensive. The HD surround vision system, ultrasonic park assist, and trailer monitoring alerts give you confidence in all driving conditions. Forward collision alert, automatic emergency braking, and lane departure warning support your awareness on the road.
This truck is ready for work, recreation, or daily driving. With white exterior paint, modern LED lighting, and a refined cabin, the Sierra 3500HD AT4 delivers professional capability without compromise. Visit our showroom to experience this truck firsthand and discover why it's built for those who demand more.
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