Meet the 2026 GMC Sierra 2500HD AT4, a silver powerhouse engineered for those who demand capability without compromise.

- Duramax 6.6L V8 Turbodiesel with 470 hp and 975 lb-ft of torque
- 10-Speed Automatic transmission with 4WD and 2-Speed Active Transfer Case
- AT4 Premium Plus Package with power sunroof and Technology Package
- Gooseneck/5th Wheel Prep Package for versatile towing setup
- BF Goodrich off-road tires on 20 high-gloss black aluminum wheels
- Power-retractable black assist steps with LED lighting
- Bose Premium 7-Speaker sound system with SiriusXM 360L trial
- HD Surround Vision and Bed View Camera with trailer provisions
- Heated and ventilated leather front seats with 10-way power adjustment
- Wireless phone projection and charging with Apple CarPlay/Android Auto
- Remote vehicle starter and push button start
- Spray-on bedliner with GMC logo and 120-volt bed outlet
- Engine block heater and 220-amp alternator for demanding conditions
- Ultrasonic front and rear park assist with trailer side blind zone alert
- Lane departure warning and automatic emergency braking

This truck arrives with just 3,532 miles, representing a one-owner vehicle backed by a clean AutoCheck history. The AT4 trim combines serious off-road capability with premium comfort, featuring heated and ventilated leather seating, an integrated technology suite, and thoughtful details like the high-clearance step and spray-on bedliner. The Duramax diesel engine delivers the torque and efficiency serious truck owners expect, while the Gooseneck/5th Wheel Prep Package provides the foundation for heavy-duty towing applications. Whether you're managing a worksite or exploring remote terrain, this truck is ready.

The exterior presents an aggressive stance with body-color wheel arch moldings, LED cargo lighting, and smoked amber roof markers that define the AT4 aesthetic. Inside, dual-zone climate control, the power sunroof, and premium sound system create an environment where serious work feels refined. Navigation, wireless connectivity, and a multicolor 15-inch head-up display keep you informed and connected.

Standard safety features include electronic stability control, traction control, hill descent control, and comprehensive airbag protection. The truck's suspension and braking systems are engineered for the demands you'll place on it, with four-wheel disc brakes and an independent front suspension designed to handle both pavement and challenging terrain.

This Sierra 2500HD AT4 represents the complete package for buyers who refuse to compromise between capability and comfort. The combination of diesel power, premium features, and off-road preparation means this truck adapts to your needs rather than forcing you to adapt to its limitations.