2026
GMC SIERRA 1500 AT4X 4X4 CREW CAB 5.75 FT. BOX (RFE)

The 2026 GMC Sierra 1500 AT4-X Crew Cab 4WD is the ultimate apex predator of the off-road lineup, pushing extreme trail performance and luxury to their absolute limits. Cloaked in a deeply saturated Onyx Black exterior paint and paired with a premium, trim-exclusive Obsidian Rush full-leather interior, this truck boasts an aggressive, high-end look. Under the hood is a monstrous 6.2L EcoTec3 V8 engine paired with a smooth-shifting 10-speed automatic transmission, channelling heavy-duty power through a 3.23 rear axle ratio. High-Output V8 & Active Exhaust: The massive 6.2L V8 engine comes paired with a premium Active Exhaust System, allowing you to change the exhaust note from a civilized purr to an aggressive, track-inspired V8 roar at the push of a button. Extreme Off-Road Hardware: Standard-equipped from the factory with cutting-edge Multimatic DSSV spool-valve dampers, front and rear electronic locking differentials, and extensive underbody steel skid plate protection. MultiPro Tailgate Audio System by Kicker: Transforms your tailgate into the ultimate entertainment center with a dealer-installed, fully integrated, weatherproof 100-watt sound system built directly into the inner gate panel. Off-Road High-Clearance Steps: Outfitted with dealer-installed rugged, high-clearance running boards engineered to provide maximum ground clearance while protecting the lower rocker panels on tight trails. Black Badging Package: Sharpens the truck's custom stealth profile with dealer-installed black GMC emblems, black badges, and matching black nameplates that blend seamlessly into the Onyx Black paint. Pro-Grade Box Utility & Security: Built for rugged use with a standard factory spray-on bedliner to shield the cargo box, paired with a dealer-installed premium tri-fold hard tonneau cover to keep your gear completely dry and secure.