2026 GMC Sierra 3500: What's New, Specs & Features
Last updated August 4, 2026
The only notable change to the 2026 GMC Sierra 3500 HD is that satellite radio moved from standard to optional on the SLE trim. Otherwise, this is a carryover year with no major update.
About the 2026 GMC Sierra 3500
4th generation (introduced for 2020), third model year after the 2024 mid-cycle refresh
GMC positions the Sierra 3500 HD as its one-ton pickup for the heaviest towing and hauling jobs, while offering more comfort and cabin technology than a basic work truck. Its identity centers on V8 power, automatic transmissions, integrated trailer controls, large cargo-bed capacity and configurations capable of handling commercial equipment, large recreational trailers or heavy payloads. Upper trims add luxury or off-road hardware without changing the truck’s core heavy-duty purpose.
The six-trim range runs from the work-focused Pro through the more comfortable SLE and SLT to the off-road AT4 and luxury-focused Denali. Pro has built-in trailering equipment and a 7-inch touchscreen, while SLE and higher trims use a 13.4-inch touchscreen and 12.3-inch digital instrument display. AT4 has standard four-wheel drive, Rancho shocks and skid plates, while Denali features perforated leather, heated and ventilated front seats and Bose audio.
What changed, by category
2026 GMC Sierra 3500 specs and features by trim
| Feature | ||||||
|---|---|---|---|---|---|---|
| Engine | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter / V8, 6.6 Liter | V8, Turbo Diesel, 6.6 Liter |
| Transmission | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison | Automatic, 10-Spd Allison |
| Drivetrain | 4WD | 4WD | 4WD | 4WD | 4WD | 4WD |
| Fuel Type | Diesel / Gas | Diesel / Gas | Diesel / Gas | Diesel / Gas | Diesel / Gas | Diesel |
| Horsepower | 401–470 hp | 401–470 hp | 401–470 hp | 401–470 hp | 401–470 hp | 470 hp |
| Torque | 464–975 lb-ft | 464–975 lb-ft | 464–975 lb-ft | 464–975 lb-ft | 464–975 lb-ft | 975 lb-ft |
| Max Towing | 21200–21300 lb | 21590–31000 lb | 21590–31000 lb | 21600–31000 lb | 21100–21200 lb | 21000–21100 lb |
| Rear Legroom | 43.4 in | 35.2–43.4 in | 35.2–43.4 in | 43.4 in | 43.4 in | 43.4 in |
| Seats | 5 | 3–6 | 3–6 | 6 | 5 | 5 |
| Doors | 4 | 2–4 | 2–4 | 4 | 4 | 4 |
| Adaptive Cruise Control | ||||||
| Alarm System | ||||||
| Automatic Emergency Braking | ||||||
| Automatic High Beams | ||||||
| Blindspot Sensors | ||||||
| Hill Descent Control | ||||||
| Lane Departure Warning | ||||||
| Park Assist | ||||||
| Rain Sensing Windshield Wipers | ||||||
| Rear View Camera | ||||||
| 360 Camera | ||||||
| Alloy Wheels | ||||||
| Auto-Dimming Exterior Mirrors | ||||||
| Fog Lights | ||||||
| Heated Mirrors | ||||||
| LED Headlights | ||||||
| Memory Exterior Mirrors | ||||||
| Power Moonroof | ||||||
| Power Folding Exterior Mirrors | ||||||
| Power Mirrors | ||||||
| Power Side Steps | ||||||
| Privacy Glass | ||||||
| Side Steps | ||||||
| Tow Hooks | ||||||
| Head-Up Display | ||||||
| Navigation System | ||||||
| Premium Audio | ||||||
| SD Card Slot | ||||||
| Satellite Radio | ||||||
| Smartphone Interface | ||||||
| Subwoofer | ||||||
| Touch Screen Monitor | ||||||
| Auto-Dimming Interior Mirror | ||||||
| Dual Power Front Seats | ||||||
| Dual-Zone Climate Control | ||||||
| Heated Front Seats | ||||||
| Heated Rear Seats | ||||||
| Heated Steering Wheel | ||||||
| Integrated Garage Door Opener | ||||||
| Leather Seats | ||||||
| Leather-Wrapped Steering Wheel | ||||||
| Massage Front Seat | ||||||
| Memory Driver's Seat | ||||||
| Power Driver Seat | ||||||
| Push-Button Engine Start | ||||||
| Remote Start | ||||||
| Tilt Wheel | ||||||
| Tilt/Telescoping Steering Wheel | ||||||
| Ventilated Front Seats | ||||||
Frequently asked questions
What changed on the 2026 GMC Sierra 3500 HD compared with the 2025 model?
Only one minor equipment change is noted for 2026: satellite radio moved from standard to optional on the SLE trim. The engines, transmissions, safety equipment, styling, cabin screens and chassis carried over.
Is the 2026 GMC Sierra 3500 HD a redesign?
No, the 2026 Sierra 3500 HD is not a redesign. It remains part of the fourth generation introduced for 2020 and follows the mid-cycle update made for 2024.
Did the 2026 GMC Sierra 3500 HD engines or transmissions change?
No, the powertrain range did not receive a significant change for 2026. The lineup retains its 6.6-liter gas V8 and 6.6-liter turbo-diesel V8 with automatic transmissions.
What distinguishes the 2026 GMC Sierra 3500 HD AT4?
The 2026 AT4 is the off-road-focused trim. It has standard four-wheel drive, Rancho shocks, off-road suspension tuning and skid plates, plus heated and ventilated leather front seats and a 13.4-inch touchscreen.
What does the 2026 GMC Sierra 3500 HD Pro focus on?
The 2026 Pro focuses on work and trailering. It has built-in trailering equipment, a trailer brake controller, a 7-inch touchscreen, wireless Apple CarPlay and Android Auto, LED headlights and the standard collision-avoidance suite.