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The GMC AT4 2500 represents the pinnacle of heavy-duty truck engineering in 2026, offering an unparalleled combination of rugged performance, advanced technology, and off-road capability. This remarkable vehicle stands as a testament to GMC’s commitment to creating versatile and powerful trucks that can handle both demanding work environments and challenging terrain.
Powerful Performance and Capability
The 2026 GMC Sierra 2500 HD AT4 delivers exceptional performance with impressive specifications that set it apart from competitors. Key performance highlights include:| Performance Metric | Specification |
|---|---|
| Maximum Towing Capacity | 21,190 lbs |
| Payload Capacity | 3,524 lbs |
| Ground Clearance | 10.1 inches |
| Wheelbase | 159.0–172.0 inches |
Equipped with a robust Duramax 6.6L Turbo-Diesel V8 engine and a 10-speed automatic transmission, the AT4 2500 provides unmatched power and smooth driving dynamics. The truck comes standard with a 4WD Crew Cab configuration, available in two bed lengths: a 6’9” standard bed and an 8’ long bed.
Off-Road Readiness and Advanced Features
The AT4 trim is specifically designed for off-road enthusiasts and professionals who demand superior performance in challenging conditions. Notable off-road features include:- Off-Road Suspension Package with twin-tube Rancho shocks
- Protective skid plates for enhanced underbody protection
- Hill Descent Control for improved stability on steep terrain
- 20-inch gloss-black aluminum wheels with available BFGoodrich off-road tires
Cutting-Edge Technology
GMC has packed the AT4 2500 with state-of-the-art technology to enhance both driving experience and functionality:- 13.4-inch diagonal premium infotainment system with Google built-in compatibility
- 12.3-inch diagonal color driver information center
- Up to 14 available camera views with HD Surround Vision
- Adaptive Cruise Control with trailering support
🚗 Note: The AT4 2500 starts at $72,200, offering exceptional value for a high-performance heavy-duty truck.
Comfort and Interior Design
The interior of the GMC AT4 2500 combines rugged functionality with premium comfort:- Jet Black interior with Kalahari accents
- Heated and ventilated front leather seats
- Wrapped heated steering wheel
- MultiPro Tailgate with six convenient functions
What engine comes standard in the GMC AT4 2500?
+The standard engine is a 6.6L Turbo-Diesel V8 paired with a 10-speed automatic transmission.
What is the maximum towing capacity?
+The GMC AT4 2500 can tow up to 21,190 lbs when properly equipped.
What makes the AT4 trim special?
+The AT4 trim offers enhanced off-road capabilities with specialized suspension, protective skid plates, and rugged design elements.
The 2026 GMC AT4 2500 represents a pinnacle of engineering, combining robust performance, advanced technology, and versatile capabilities. Whether you’re tackling tough work sites or exploring challenging terrains, this heavy-duty truck delivers exceptional performance and comfort that sets a new standard in the truck market.
