Key Features of the 2026 GMC Sierra 3500 HD

Duramax 6.6L Turbo-Diesel V8 with 10-speed automatic

The heart of the Sierra 3500 HD’s heavy-lifting confidence is the available Duramax 6.6L Turbo-Diesel V8, paired with a 10-speed automatic transmission engineered to keep the engine in its ideal power band. The broad torque curve and closely managed gearing provide reassuring response off the line and smooth pull-through when accelerating with a trailer. Whether you’re crossing town with a skid steer or guiding a multi-axle fifth-wheel down the highway, this powertrain’s refinement stands out — quiet when cruising, authoritative when called upon. For buyers who split their time between jobsite and family travel, the diesel’s balance of effortless torque and relaxed highway character is a difference you feel, particularly when merging, passing, and climbing grades with a full load.

ProGrade® Trailering System with In-Vehicle Trailering App

Trailering can be simpler — and the Sierra HD shows how. The available ProGrade Trailering System centralizes setup, safety checks, and monitoring so you spend less time fussing and more time moving. Use the In-Vehicle Trailering App to create trailer profiles, check lights, monitor tire pressures on compatible setups, and follow step-by-step checklists that reduce guesswork. Add in available Adaptive Cruise Control with trailering for smoother highway pacing, and long miles become more predictable and less fatiguing. If you’re new to heavy trailers, these integrated tools shorten the learning curve. If you’re a veteran hauler, they sharpen your process, keep you informed, and help you stay in control when conditions change.

Up to 14 available camera views including Transparent Trailer View

Visibility is confidence — particularly with big equipment or longer trailers. With up to 14 available camera views, the Sierra 3500 HD lets you see what’s traditionally hidden. Transparent Trailer View is the headliner, digitally “looking through” the trailer to help you watch for traffic directly behind. Add HD Surround Vision to spot obstacles around the truck at low speeds, use Hitch Guidance to line up quickly, and rely on bed and rear camera angles to monitor payload or check couplers on the fly. Backing into tight spaces or edging a trailer onto a narrow driveway feels less stressful when you’ve got eyes everywhere, and those extra perspectives help protect your time, your equipment, and your crew.

MultiPro™ Tailgate and available MultiPro Tailgate Audio System by Kicker®

Whether you’re loading material, staging tools for a crew, or setting up at a weekend site, the available MultiPro Tailgate is like having multiple gates in one. Its configurable panels create a full-width step, a load stop for longer items, and an elevated work surface for on-site tasks. Pair it with the available MultiPro Tailgate Audio System by Kicker® and you’ve got a rugged, integrated sound solution powered right from the tailgate — no external wires or batteries. When you combine MultiPro with the Sierra HD’s best-in-class HD cargo bed volume, you get a work area that adapts to awkward loads, improves ergonomics, and helps you stay organized on busy days.

Advanced interior displays: 13.4" center touchscreen and 12.3" digital Driver Information Center

Inside, the Sierra 3500 HD emphasizes clarity and command. The available 13.4-inch diagonal center touchscreen provides a spacious canvas for navigation, camera views, and the In-Vehicle Trailering App, while the 12.3-inch diagonal digital Driver Information Center places essential data directly in front of you. Wireless Apple CarPlay® and wireless Android Auto™ compatibility help keep cords out of the way. Available features like a 15-inch diagonal Head-Up Display add yet another layer of at-a-glance information — especially helpful when towing. From SLT refinement to Denali Ultimate luxury with its Bose® Premium Series with Centerpoint® surround sound and authentic wood accents, the cab can feel like a mobile command center tailored to your day.