2026 GMC Sierra 3500

At McKenzie Buick GMC, we've proudly served Milton, FL and the surrounding communities since 1967. As a family-first dealership, we believe in doing business the right way—with transparent pricing both online and in-store, no surprises, and no games. Come experience the McKenzie Advantage and see why generations of customers say, We Are McKenzie.

- 13.4 Diagonal Color Touch Screen GMC Premium Infotainment
- Wireless Apple CarPlay and Android Auto
- HD Surround Vision with Bed View Camera and Trailer Camera Provisions
- Duramax 6.6L V8 Turbodiesel with 470 hp and 975 lb-ft of torque
- Denali Reserve Package with Power Sunroof
- Gooseneck/5th Wheel Prep Package with hitch platform and bed-mounted 7-pin harness
- 20 High Gloss Black Painted Wheels with LPO finish
- Premium Denali appointments with Black Badging Package
- Off-Road Suspension with 2-Speed Active Transfer Case
- Bose Premium 7-Speaker Sound System with SiriusXM 360L Trial
- Trailer Tire Pressure Monitor Sensors with four included sensors
- Power-Retractable Assist Steps with LED perimeter lighting
- Upfitter Switch Kit with five configurable circuits (3-30 amp and 2-20 amp)
- Multicolor 15 Diagonal Head-Up Display
- Heated and Ventilated Leather Front Seats with 12-Way Power Adjustment

This 2026 Sierra 3500HD Denali arrives in commanding Black exterior with every premium feature you'd expect from GMC's flagship heavy-duty truck. The legendary Duramax diesel engine delivers the power and torque you need for serious work, paired with a 10-speed automatic transmission and confident 4WD capability. With low mileage, this truck represents an exceptional opportunity to own a factory-fresh workhorse.

The Denali Reserve Package elevates your ownership experience with luxury touches and technology integration. The 13.4-inch infotainment display provides intuitive control of your truck's features, while wireless smartphone projection keeps you connected safely on the road. Advanced surround vision cameras and trailer features give you complete confidence whether navigating tight spaces or managing complex towing scenarios.

Built for those who demand both capability and refinement, this truck combines genuine wood accents, Forge perforated leather seating, and heated and ventilated front seats with serious work-ready infrastructure. The Gooseneck/5th Wheel Prep Package demonstrates GMC's commitment to serious hauling capability, complete with hitch platform, bed-mounted 7-pin trailer harness, and stamped bed holes with removable caps.

Additional factory-installed features include an engine block heater, 220-amp alternator, high idle switch, and a comprehensive five-circuit Upfitter Switch Kit. Power-retractable assist steps with LED lighting enhance entry and exit, while the spray-on bedliner with GMC logo protects your investment. Trailer tire pressure monitoring provides real-time visibility into conditions affec