2026 GMC Sierra 3500 HD Engines & Performance

Pulling a loaded equipment trailer up a grade takes deep reserves of power, and the 2026 GMC Sierra 3500 HD builds them in. A 6.6L V8 gas engine with 401 horsepower comes standard on most trims, and the available 6.6L Duramax® turbo diesel V8 engine raises output to 470 horsepower. Each engine is paired with an Allison® ten-speed automatic transmission and rear-wheel drive (RWD) or four-wheel drive (4WD). When properly equipped, the diesel supports gooseneck trailering of up to 36,000 pounds.

See the following engine specifications for more details.

2026 GMC Sierra 3500 HD Exterior Design

Loading lumber goes quicker when the tailgate works with you, and the available GMC MultiPro™ tailgate on the 2026 GMC Sierra 3500 HD serves as a step, a work surface, and a load stop. Durable touches, such as a side bed step and 12 cargo tie-downs, simplify hauling day to day. Available chrome accents and power-retractable assist steps add polish for the drive to dinner.

Available exterior design features include:

• All-terrain tires
• 18- or 20-in. wheels
• Signature chrome Denali and Vader Chrome grilles
• Power-retractable assist steps with LED perimeter lighting
• Animated LED projector headlamps with LED turn signals and daytime running lamps
• LED taillamps, fog lamps, and cargo bed lighting
• Rainsense™ automatic windshield wipers
• Power-adjustable vertical trailering mirrors with power-folding/extending and auto-dimming upper glass
• Side bed step
• CornerStep rear bumper
• 12 cargo tie-downs
• Spray-on bed liner
• GMC MultiPro tailgate

2026 GMC Sierra 3500 HD Interior Design

Comfort carries a crew through extended drives, and the cabin of the 2026 GMC Sierra 3500 HD rises to the task with seating for up to six and easy-care materials. Seat upholstery options include vinyl, cloth, and available perforated leather, with available full-grain leather and 16-way power front seats with massage for a first-class feel. Cold-weather comforts such as available heated front seats make winter mornings in the cab easier.

Available interior design features include:

• Power sunroof
• Vinyl, cloth, perforated leather, Forge perforated leather, and full-grain leather seat upholstery
• 40/20/40 split front bench seat with four-way manual outboard seats and under-seat storage
• Front bucket seats
• 16-way power front seats with massage
• Heated front seats
• Ventilated front seats
• Heated rear outboard seats
• Driver's memory feature
• 60/40 split-folding rear bench seat (double and crew cab)
• Heated, leather-wrapped steering wheel
• Dual-zone automatic climate control
• Auto-dimming rearview mirror
• Rear camera mirror
• Universal home remote

2026 GMC Sierra 3500 HD Seating & Cargo Capacity

Matching your 2026 GMC Sierra 3500 HD to the trailer starts with the right footprint. Regular, double, and crew cab styles are offered, with the regular and double cab pairing to the long bed and the crew cab offering a standard or long bed. Single-rear-wheel (SRW) and dual-rear-wheel (DRW) setups let you match the chassis to the job. There's room for equipment of many shapes with up to 83.5 cubic feet of cargo volume in the long bed, and rear-seat passengers in the crew cab stretch out with 43.4 inches of rear legroom.

See the following cab and bed specifications for more details.

2026 GMC Sierra 3500 HD Technology

Directions, playlists, and trailer checks all land on one screen in the 2026 GMC Sierra 3500 HD. The available 13.4-inch GMC Premium Infotainment system with Google built-in puts navigation and voice help front and center, and wireless Apple CarPlay® and Android Auto™ bring your phone's apps and maps to the touchscreen. Two available Bose® sound systems bring dynamic audio quality to the cab, and the available MultiPro tailgate audio system by Kicker® carries the music into the bed.

Available technology features include:

• 12.3-in. multicolor digital driver information center
• 15-in. head-up display
• 13.4-in. GMC Premium Infotainment system with Google built-in
• Wireless Apple CarPlay and Android Auto
• Six-speaker, seven-speaker Bose, or 12-speaker Bose Premium Series audio system with CenterPoint®
• MultiPro tailgate audio system by Kicker®
• SiriusXM® with 360L capability
• Wi-Fi® hotspot capability
• In-vehicle trailering app
• Wireless charging
• 120V power outlets in cab and bed
• Remote start

2026 GMC Sierra 3500 HD Driver Assist & Safety Features

Watching mirrors, blind zones, and a trailer at once is a tall order, so the 2026 GMC Sierra 3500 HD is equipped with the standard Sierra HD Pro Safety suite of driver assistance features. A range of available camera views helps you monitor the bed, the hitch, and the road behind, and available trailering alerts extend blind zone coverage along the trailer. These systems provide support while you stay in control of every tow.

Available driver assist and safety features include:

• Sierra HD Pro Safety
  • Forward collision alert
  • Following distance indicator
  • Front pedestrian braking
  • IntelliBeam® automatic high beams
  • Lane departure warning
  • Buckle to Drive technology
• Automatic emergency braking
• Adaptive cruise control
• HD rear vision camera
• HD surround vision
• Bed view camera
• Hitch view
• Hitch guidance
• Trailering camera provisions
• Trailer side blind zone alert
• Rear cross-traffic alert
• Front and rear park assist
• Safety alert seat
• Teen Driver technology

2026 GMC Sierra 3500 HD Colors Available

• Summit White
• Onyx Black
• Sterling Metallic
• Titanium Rush Metallic
• Volcanic Red Tintcoat
• Glacier White Tricoat
• Downpour Metallic
• Coastal Dune
• Cardinal Red

2026 GMC Sierra 3500 HD Trims Available

• Pro $50,995*
• SLE $57,995*
• SLT $69,195*
• AT4 $76,195*
• Denali $79,095*
• Denali Ultimate $100,395*

New GMC Sierra 3500 HD for Sale in Kokomo, IN

Ready to hook up and haul? Check our inventory to see which 2026 GMC Sierra 3500 HD configurations are currently available at McGonigal Buick GMC in Kokomo, IN. Schedule a test drive to feel the V8 power for yourself. Our team welcomes any questions, so contact us online or call us at (765) 459-0381.