The 2026 GMC Sierra 2500HD AT4 is a powerful and capable truck that's ready to take on any adventure. Equipped with a robust Duramax 6.6L V8 Turbodiesel engine and a 10-speed automatic transmission, this Sierra 2500HD delivers exceptional performance and towing capacity.- Duramax 6.6L V8 Turbodieged Engine (470 hp, 975 lb-ft of torque)- AT4 Preferred Package- AT4 Premium Plus Package- Black Badging Package- Cargo Convenience Package- Gooseneck/5th Wheel Prep Package- Hitch Package- Preferred Equipment Group 4SB- Technology Package- X31 Off-Road Package- Bose Premium 7-Speaker Sound System- SiriusXM with 360L Trial Subscription- Steering Wheel Audio Controls- Electric Rear-Window Defogger- 120-Volt Bed Mounted Power Outlet- 120-Volt Instrument Panel Power OutletThis Sierra 2500HD AT4 is equipped with a host of advanced features and technologies to enhance your driving experience. From the Multicolor 15"" Diagonal Head-Up Display to the Wireless Charging and Wireless Phone Projection, this truck is designed to keep you connected and in control.Comfort and convenience are also priorities, with features like Heated and Ventilated Front Seats, Heated Rear Seats, and a Power Sunroof. The AT4 trim level also adds rugged off-road capabilities, including Hill Descent Control, Off-Road Suspension, and a 2-Speed Active Transfer Case.With its striking Beige exterior and low mileage, this 2026 GMC Sierra 2500HD AT4 is a must-see. Schedule a test drive today and experience the power and versatility of this exceptional truck.Why Buy from Southwest Buick GMC LawtonSouthwest Buick GMC makes car buying straightforward with true transparent pricing, no hidden fees, and no market adjustments. We offer strong trade-in values and a wide selection of new Buick and GMC models, certified pre-owned options, and quality used vehicles. We'll buy your car even if you don't purchase from us. Proudly serving drivers in Lawton, Duncan, Chickasha, Elgin, Wichita Falls, Norman, OKC, and surrounding areas. Shop online or stop by today for a dealership experience built on honesty and efficiency. Price includes: $1000 - Purchase Allowance. Exp. 06/30/2026 Price includes dealer added accessories.