Get the job done right with this 2026 GMC Sierra 3500HD SLE 4WD Crew Cab Long Box—built to deliver serious power, advanced technology, and everyday comfort in one rugged package. Whether you're towing, hauling, or heading to the job site, this heavy-duty truck is ready for anything.Powered by a robust 6.6L V8 gas engine paired with a smooth 10-speed automatic transmission, the Sierra 3500HD delivers an impressive 401 horsepower and 464 lb-ft of torque, giving you the strength you need for demanding workloads. With a maximum conventional towing capacity of up to 20,000 lbs, this truck is built to handle heavy trailers and equipment with ease.The Crew Cab configuration offers a spacious and comfortable interior with generous headroom and legroom for both front and rear passengers—perfect for long days on the road or transporting your crew. Paired with the 8-foot long box, you get maximum cargo capacity, ideal for hauling full-size materials, tools, or job site equipment.Inside, the SLE trim blends functionality with modern tech, featuring a large 13.4" GMC Infotainment System with Google built-in, along with wireless Apple CarPlay® and Android Auto™ to keep you connected on the go. A 12.3" digital driver information center keeps key vehicle data front and center for added convenience.Built for capability, this Sierra comes equipped with 4WD, a heavy-duty suspension, and advanced trailering technologies to give you confidence when towing or navigating tough terrain.