The 2026 Sierra 3500HD lineup includes a range of trims, each crafted to meet specific work and lifestyle demands. The Pro trim provides a solid foundation for job sites with its durable frame, bold grille, and essential equipment. SLE adds polish with chrome accents and enhanced interior connectivity, while SLT introduces 18-inch aluminum wheels, power-folding mirrors, and signature LED lighting. For rugged capability, the AT4 is trail-ready with a 2-inch factory lift, skid plates, and all-terrain tires. The Denali adds sophisticated flair with chrome detailing, 20-inch polished wheels, and a premium GMC grille. Topping the lineup, the Denali Ultimate features 22-inch wheels, exclusive Vader Chrome trim, power-assist steps, and GMC’s most advanced HD truck technology yet.

The Sierra 3500HD offers two power-packed engine options. The standard 6.6L V8 gas engine delivers 401 hp and 464 lb.-ft. of torque, perfect for everyday hauling. For heavy-duty jobs, the available 6.6L Duramax® Turbo-Diesel V8 ramps up the performance to 445 hp and 910 lb.-ft. of torque, ideal for tackling demanding loads and long hauls. Both engines are paired with a 10-speed automatic transmission, ensuring optimal power distribution for work or play.

With a conventional towing capacity of up to 36,000 lbs. when properly equipped, the 2026 Sierra 3500HD dominates the job site. Trailering is made simple with the ProGrade™ Trailering System, which includes trailer hitch guidance and a rearview camera to assist with precision towing. The available off-road package boosts capability further with upgraded suspension and traction enhancements, perfect for navigating uneven terrain around Karnes County.

Inside, the Sierra 3500HD balances rugged durability with upscale refinement. Depending on the cab configuration, it offers seating for up to six, with options like leather-appointed upholstery, ventilated front seats, and generous legroom in the rear. Technology is front and center, with available 8-inch or 12.3-inch digital displays, customizable for navigation, vehicle information, and more. Smart storage solutions and a thoughtfully designed center console make it functional for work and road trips alike.

Safety is integral to the Sierra 3500HD’s design, featuring a high-strength steel frame and an array of standard airbags. GMC’s advanced driver-assist systems include Forward Collision Alert, Lane Departure Warning, and Automatic Emergency Braking. Available upgrades like Rear Cross Traffic Alert and the Safety Alert Seat enhance situational awareness, while a 360-degree camera system supports tight maneuvering and trailering accuracy.