This 2021 GMC Sierra 2500HD AT4 delivers the capability and refinement you need for serious work or weekend adventures.

- Duramax 6.6L V8 Turbodiesel engine with 445 hp and 910 lb-ft of torque
- 10-Speed Automatic transmission with 4WD
- Power Sunroof
- Gooseneck/5th Wheel Prep Package with Bed View Camera
- AT4 Preferred Package featuring 8" Premium GMC Infotainment with Navigation
- HD Surround Vision with Two Trailer View Camera Provisions
- Bose Premium Audio System with SiriusXM 360L
- Driver Alert Package I with Front and Rear Park Assist, Lane Change Alert, and Rear Cross Traffic Alert
- 20" Machined Aluminum Wheels with Black Accents
- Heated and Ventilated Front Seats
- Wireless Charging and Apple CarPlay/Android Auto
- Hard-Folding Tonneau Cover
- Engine Block Heater
- 220 Amp Alternator
- Spray-On Pickup Box Bed Liner with AT4 Logo

The AT4 package represents GMC's commitment to capability without compromise. With the legendary Duramax diesel engine, this Sierra delivers the power needed for towing and hauling while maintaining efficiency for everyday driving. The 10-speed automatic transmission works seamlessly with the 4WD system to handle any terrain or weather condition you encounter.

Inside, the cabin reflects premium craftsmanship. The 8" infotainment system with navigation keeps you connected and informed, while the Bose audio system ensures every drive sounds exceptional. Apple CarPlay and Android Auto integration means your preferred apps are always accessible. The heated and ventilated front seats provide comfort through changing seasons, and wireless charging eliminates the need for tangled cables.

Safety and visibility stand out with the Driver Alert Package, which includes ultrasonic front and rear park assist, lane change alert with side blind zone detection, and rear cross traffic alert. The HD surround vision system provides complete awareness around your truck, while the bed view camera with trailer provisions makes backing up with cargo or a trailer straightforward and confident.

For those who tow, the gooseneck/5th wheel prep package combines with the integrated trailer brake controller and in-vehicle trailering system app to make towing intuitive and manageable. The 220-amp alternator ensures you have the electrical capacity for all your equipment and accessories.

The exterior reflects the AT4's purposeful design. Twenty-inch machined aluminum wheels with black accents, the black sport step, and the hard-folding tonneau cover blend style with function. The spray-on bed liner protects your investment, while LED cargo lighting illuminates the work area at night.

At 87,000 miles, this Sierra has been responsibly maintained and remains a capable platform for years of service. The combination of the legendary Duramax diesel, comprehensive safety features, premium interior appointments, and AT4-specific enhancements makes this truck ready for whatever you ask of it.