Contact Hall Buick GMC today for information on dozens of vehicles like this 2026 GMC Sierra 2500HD AT4. This GMC includes: COASTAL DUNE ASSIST HANDLE, SIDE TRANSMISSION, 10-SPEED AUTOMATIC A/T 10-Speed A/T 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 EMISSIONS, FEDERAL REQUIREMENTS HIGH IDLE SWITCH LPO, BLACK BADGING PACKAGE REAR AXLE, 3.42 RATIO GVWR, 11,550 LBS GOOSENECK / 5TH WHEEL PREP PACKAGE LPO, HITCH PACKAGE Tow Hitch Note - For third party subscriptions or services, please contact the dealer for more information. You appreciate the finer things in life, the vehicle you drive should not be the exception. Style, performance, sophistication is in a class of its own with this stunning GMC Sierra 2500HD AT4. Want to brave the road less traveled? You'll have the 4WD capabilities to do it with this vehicle. Just what you've been looking for. With quality in mind, this vehicle is the perfect addition to take home.