2025 GMC Sierra 3500 4wd Crew Cab 159The 2025 GMC Sierra 2500HD Denali Ultimate Crew Cab 4×4 in Onyx Black is the pinnacle of premium heavy-duty capability. Built for drivers who demand strength, refinement, and cutting-edge technology, this Sierra blends the power of a true workhorse with the comfort and sophistication of a luxury SUV. Its bold exterior is elevated with chrome accents, power-retractable assist steps with perimeter lighting, 20-inch machined aluminum wheels, LED lighting throughout, and the signature GMC MultiPro Tailgate with an integrated Kicker audio system. From job sites to long-distance towing, this truck makes a statement everywhere it goes.
Under the hood, the Sierra Denali Ultimate is powered by the legendary 6.6L Duramax Turbo-Diesel V8, paired with the Allison 10-speed automatic transmission - a combination known for exceptional torque, smooth power delivery, and long-term durability. With a GVWR of 12,100 lb, a 3.42 rear axle, an exhaust brake, Autotrac 4WD, and the Gooseneck/5th Wheel Prep Package, this truck is engineered for serious towing. Features like Hitch Guidance, Hitch View, Trailer Camera Provisions, Trailer Side Blind Zone Alert, and the full Trailering App give you unmatched confidence when hauling heavy loads.
Inside, the Denali Ultimate cabin surrounds you with premium craftsmanship and advanced comfort. The exclusive Alpine Umber interior features full-grain leather, real wood trim, and intricate stitching that sets a new standard for luxury in a heavy-duty truck. Heated and ventilated front bucket seats with massage, power bolsters, and 4-way lumbar adjustment ensure long-distance comfort, while heated second-row outboard seats keep passengers warm in Canadian winters. A dual-pane panoramic sunroof opens the cabin with natural light, and the power sliding rear window adds ventilation and convenience.
Technology is front and center in this Sierra. The 13.4-inch Premium GMC Infotainment System with Google built-in provides seamless navigation, voice assistance, and app integration. A 12-inch reconfigurable digital driver display, 15-inch Head-Up Display, Rear Camera Mirror, and HD Surround Vision give you a complete view of your surroundings. Wireless charging, multiple USB ports, a 120V outlet, and the Bose premium audio system ensure every drive is connected and enjoyable. The Technology Package enhances the experience even further with advanced camera views and driver-focused innovations.
Safety is engineered into every part of the Sierra Denali Ultimate. With GMC Pro Safety and the Safety Package, you get Forward Collision Alert, Automatic Emergency Braking, Lane Departure Warning, Front Pedestrian Braking, Rear Cross Traffic Alert, Following Distance Indicator, Adaptive Cruise Control, and the Driver Safety Alert Seat. LED headlamps, fog lamps, roof marker lamps, and task lighting on the mirrors ensure visibility in all conditions. Teen Driver Mode, Buckle to Drive, and the Rear Seat Reminder add peace of mind for families.
From its diesel powertrain and advanced towing systems to its luxurious interior and state-of-the-art technology, the 2025 GMC Sierra 2500HD Denali Ultimate Crew Cab 4×4 is built for those who want the absolute best in capability and refinement. Visit us at Seaside Chevrolet GMC to experience this exceptional truck in person - its presence, comfort, and power truly set it apart.
SERVICE PERFORMED:
This vehicle received a full used-car safety and mechanical check. We did an oil change with a new filter, along with a fresh cabin air filter and engine air filter to improve air quality and performance. The truck was professionally detailed inside and out - leaving it looking refreshed and lot-ready - and the extra set of tires were placed in storage for safe keeping.
SEASIDE PROMISE:
This professionally detailed vehicle has undergone a thorough inspection performed by our in-house certified GM technicians, and we also ensure that a new NB safety inspection will be performed for you.
Although we do our best to ensure our description accurately depicts the vehicle; we encourage you to reach out to our sales team and confirm all equipment and options. Pre-owned vehicles may have some custom modifications or additional equipment.
You can reach us, locally at 506-532-6666, or toll free at 1-877-203-0590, to confirm availability, schedule a test drive; or speak to one of our qualified experts to answer any questions you may have. We also offer financing with all major financial institutions. Let our financial specialists secure your best rate possible.
Trade-ins welcome. Visit Seaside Chev in Shediac today or call us to schedule a test drive!
