2025 GMC Sierra 3500 HD

The Sierra 3500 HD’s trims offer more than just good looks—they’re built for purpose, matching utility with aesthetics in an unmistakably GMC way. The introductory Pro, SLE, and SLT trims offer essentials like an EZ Lift power tailgate, LED lighting ranging headlamps to cargo bed, rain-sensing wipers, and foldable trailering mirrors with spot lamps. The off-road-ready AT4 and AT4X are packed with extreme features, with the exclusive AEV AT4X Edition boasting AEV-stamped steel skid plates, 18-inch racing-inspired wheels housing up to 35-inch MT tires, and 10.1 inches of ground clearance. If you crave luxury after a long day, the Denali’s signature chrome accents and upscale grille announce its premium character, while the opulent, top-tier Denali Ultimate stuns from every angle, showing off its Vader Chrome grille, 20-inch ultra-bright machined aluminum wheels with gloss-black inserts, and premium lighting. Whether choosing a crew cab, long bed, or a configuration that meets the demands of both work and recreation, the Sierra 3500 HD lineup offers a selection suited to every type of job and lifestyle.

The 2025 Sierra 3500 HD offers two engine options that deliver exceptional performance: the 6.6L V8 gasoline engine brings a solid 401 hp right out the gate, along with 464 lbs.-ft. of torque—ideal for everyday hauling and frequent driving. For those needing greater capability, the Duramax® 6.6L Turbo-Diesel V8 brings an impressive 470 hp and a formidable 975 lbs.-ft. of low-end torque, letting it haul heavy loads and handle steeper inclines. Paired with the Allison® 10-speed automatic transmission, both engines offer smooth, responsive control, adapting easily to different driving conditions.?

Engineered for endurance and equipped to handle the toughest tasks, the Sierra 3500 HD’s performance capabilities go beyond sheer power. This truck’s 36,000 lb. towing capacity is a game-changer for St. Louis drivers who haul heavy equipment and trailers. The available Trailering Package integrates features like Transparent Trailer View, Adaptive Cruise Control with Trailering, and Hitch Guidance with Hitch View, among others to support safety and ease. For rougher paths, the AT4 and AT4X come equipped with off-road tuned suspension, Multimatic DSSV dampers, rear e-locking differential, twin-tube shocks, and Hill Descent Control. The Sierra 3500 HD is precision engineered to meet your every demand.

The interior of the 2025 Sierra 3500 HD balances durability with thoughtful comfort, making it a practical, yet welcoming space. Designed to support both work and leisure, the cabin is roomy enough to carry tools, equipment, and passengers comfortably, offering Best-in-Class Crew Cab Front Headroom and Legroom. The Denali Ultimate provides a safe haven with Best-in-Class full-grain leather embossed and laser-etched with a topographical map of Mt. Denali, not to mention real wood accents and 16-way adjustability with massage. The available Largest-in-Class 13.4-inch customizable infotainment display offers navigation, wireless smartphone integration, and more to keep you connected. Flexible storage options, including a lockable console-mounted safe, and adaptable seating configurations create a versatile interior that meets the ever-changing needs of daily life, ensuring comfort and convenience regardless of the destination.

Loaded with features designed to keep drivers secure and aware on any road, the 2025 Sierra 3500 HD is a confident partner for all driving situations. The Pro Safety package brings tools like Forward Collision Alert, Lane Departure Warning, and Automatic Emergency Braking, all of which provide critical support for St. Louis’ varied routes. The HD Surround Vision and Rear Camera Mirror work together to create a clear view of the truck’s surroundings, with or without a trailer, while Front and Rear Park Assist simplify tight maneuvers and parking spots. The Sierra 3500 HD is more than a truck—it’s your vigilant co-pilot.