This 2026 GMC Sierra 2500HD AT4 is offered to you for sale by Legacy Buick GMC. This GMC includes: GOOSENECK / 5TH WHEEL PREP PACKAGE LPO, HARD FOLDING TRUCK BED COVER BY REALTRUCK ADVANTAGE Pickup Bed Tonneau Cover ALTERNATORS, DUAL, 220-AMPS PRIMARY, 170-AMPS AUXILIARY TRANSMISSION, 10-SPEED AUTOMATIC A/T 10-Speed A/T LPO, 22 Aluminum Wheels ONYX BLACK GVWR, 11,350 LBS ENGINE, DURAMAX 6.6L TURBO-DIESEL V8, B20-DIESEL COMPATIBLE Diesel Fuel 8 Cylinder Engine Turbocharged AT4 PREMIUM PLUS PACKAGE Generic Sun/Moonroof Sun/Moonroof Running Boards/Side Steps *Note - For third party subscriptions or services, please contact the dealer for more information.* There's a level of quality and refinement in this GMC Sierra 2500HD AT4 that you won't find in your average vehicle. Taking the road less traveled has never been more fun than with this 4WD. With improved performance, mileage and acceleration, this 2026 4WD GMC Sierra 2500HD AT4 is king of the off-road. You could keep looking, but why? You've found the perfect vehicle right here. Dealer Disclosure: Prices do not include state and local tax, title, license, notarial fees, convenience fees, documentary fees, and any finance charges. All prices, specifications and availability subject to change without notice. Contact dealer for most current information .Not available with special finance, lease and some other offers.