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6.6L Duramax Turbo-Diesel V8 engine with 470 hp and 975 lb-ft of torque
Allison 10-speed automatic transmission for smooth power delivery
Massive towing capacity of over 36,000 lbs (when properly equipped)
Advanced trailer towing tech including Transparent Trailer View and Trailer Side Blind Zone Alert
4WD system with off-road capabilities and heavy-duty suspension
Vader Chrome exterior accents and bold Denali Ultimate badging
20" machined aluminum wheels with high-gloss black accents
Power-retractable running boards with LED lighting
MultiPro Tailgate with six functional configurations
Full-grain leather upholstery with laser-etched wood trim
Front massaging seats with heat and ventilation
Heated second-row outboard seats
16-way power front seats with memory function
Premium Bose sound system
Power-sliding rear window and panoramic sunroof
13.4" touchscreen infotainment system with Google built-in
12.3" digital driver display + 15" Head-Up Display
Wireless Apple CarPlay and Android Auto
360° HD Surround Vision camera system
Adaptive Cruise Control with trailering
Safety features: Automatic Emergency Braking, Lane Keep Assist, Front & Rear Park Assist
The 2025 Sierra 3500HD Denali Ultimate with the 6.6L Duramax engine blends incredible diesel power with first-class refinement. Whether you're towing, hauling, or just enjoying the ride, it offers confidence, comfort, and cutting-edge tech in every mile.