Meet the 2026 GMC Sierra 3500HD AT4, a full-size heavy-duty pickup engineered for those who demand capability, comfort, and confidence on every job and every road.

- Duramax 6.6L V8 Turbodiesel engine with 470 hp and 975 lb-ft of torque
- 10-Speed Automatic transmission with 4WD and 2-Speed Active Transfer Case
- AT4 Premium Plus Package with power sunroof and Technology Package
- Off-Road High Clearance step with all-terrain capability
- Premium GMC Infotainment System with 13.4 diagonal display and wireless phone projection
- Multicolor 15 Head-Up Display for enhanced visibility and safety
- Bose Premium 7-Speaker Sound System with SiriusXM satellite radio
- Black power-retractable assist steps with LED lighting
- Heated and ventilated leather front seats with 10-way power adjustment
- Advanced safety suite including automatic emergency braking and surround vision cameras
- Spray-on bedliner with GMC logo and 120-volt bed-mounted power outlet
- 20 high-gloss black aluminum wheels
- Heated steering wheel and tri-zone automatic climate control

This Sierra 3500HD arrives finished in sophisticated Silver with a well-appointed interior designed for long hours of work or relaxation. The Duramax diesel engine combines raw power with efficiency, delivering the torque needed for hauling and towing while the intelligent transmission keeps you in control. Whether you're navigating challenging terrain or cruising the highway, the AT4 package provides the suspension geometry and clearance that serious truck owners expect.

The cabin reflects GMC's commitment to premium truck living. Leather seating surfaces, heated rear outboard seats, and memory functions for the driver ensure you stay comfortable through extended shifts. The Technology Package brings modern convenience with wireless charging, automatic high-beam headlights, and a comprehensive camera system including bed view, trailer cameras, and surround vision that simplifies maneuvering in tight spaces.

Safety technology is integrated throughout. Automatic emergency braking, lane departure warning, rear cross-traffic alert, and ultrasonic park assist provide peace of mind whether you're at the job site or in town. The Safety Alert Seat adds another layer of awareness, while multiple airbags and stability systems work together to protect you and your passengers.

With practical features like the engine block heater for cold starts, exhaust brake for engine braking control, and an 80 amp-hour battery paired with a 220-amp alternator, this truck is built for demanding work cycles. The spray-on bedliner protects your cargo area, and the bed-mounted power outlet powers your tools and equipment wherever the job takes you.

The 2026 GMC Sierra 3500HD AT4 represents genuine truck capability married to genuine comfort. Come see this impressive machine in person and feel the quality of the engineering and appointments. Our team can walk you through every feature and discuss how this truck fits your needs.

Why Buy from Triple Crown Ford in Stephenville, TX?

At Triple Crown Ford, transparency isn't just a promise — it's how we do business. We believe in upfront pricing with no hidden fees, no dealer add-ons, and no surprises. Every vehicle on our lot is clearly priced, with honest information and a straightforward buying process. Our team is dedicated to helping you find the right vehicle for your needs — not upselling you on extras you don't want. Experience a no-pressure, no-gimmick car buying experience built on trust, integrity, and true Texas hospitality at Triple Crown Ford in Stephenville, TX.