2026 GMC Sierra 2500HD AT4

Experience the power and capability of the 2026 GMC Sierra 2500HD AT4, designed for demanding work and rugged adventures with premium comfort and advanced technology.

This new 2026 Sierra 2500HD AT4 Crew Cab Long Bed features a robust 6.6L V8 engine with direct injection and variable valve timing, delivering 401 horsepower and 464 lb-ft of torque. Paired with a smooth 10-speed automatic transmission and 4x4 drivetrain, it offers exceptional towing and off-road performance. The Gooseneck/5th Wheel Prep Package includes a hitch platform and bed-mounted 7-pin trailer harness, ready for heavy-duty towing needs.

Inside, enjoy heated and cooled leather bucket seats with power adjustments and memory settings for driver and passenger, plus adjustable lumbar support. The AT4 Premium Plus Package adds a power sunroof and advanced Technology Package for enhanced convenience. Safety is comprehensive with features like Automatic Highbeams, Blind Spot Monitor, Cross-Traffic Alert, Front Collision Mitigation, Lane Departure Warning, and multiple airbags.

Exterior highlights include a bed liner, integrated tailgate step, running boards, heated and power-folding mirrors with memory, and front and rear moulded splash guards. Additional utility comes from tow hooks, a tow hitch, and a fold-out assist handle mounted in the bed. This Sierra 2500HD AT4 is built to handle tough jobs while keeping you comfortable and connected.