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2025 GMC Sierra 3500: What's New, Specs & Features
Last updated August 4, 2026
The 2025 GMC Sierra 3500's main change is expanded standard towing and driver-assistance equipment, not a redesign. Its engines, 10-speed automatic transmission, styling, structure and main cabin technology carry over after the 2024 refresh.
About the 2025 GMC Sierra 3500
4th generation (introduced for 2020), second model year after the 2024 mid-cycle refresh
GMC positions the Sierra 3500 as its maximum-duty pickup for heavy trailers, high payloads and demanding jobsite use, with towing capacity reaching 36,000 pounds in the proper configuration. Its key distinction is breadth: the same heavy-duty frame and V8 capability support basic work trucks, an off-road model and luxury-focused versions with large displays, advanced towing tools and premium cabin materials.
The Pro is the straightforward work truck, with V8 power, factory towing hardware and wireless Apple CarPlay and Android Auto. AT4 adds standard 4WD, an off-road suspension and skid plates. Denali emphasizes leather, genuine wood and metal trim, and large digital displays.
What changed, by category
Safety
Cruise control becomes standard across the lineup because Pro gains it. AT4 and Denali move adaptive cruise control with trailering from optional to standard, and AT4 makes park assist standard.
Tech
Pro gains a standard integrated trailer brake controller, making this towing aid standard across the lineup. SLT adds a standard 120-volt dashboard power outlet.
2025 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, 6.6 Liter / V8, Turbo Diesel, 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 | Gas / Diesel | 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
Is the 2025 GMC Sierra 3500 a redesign?
No. The 2025 Sierra 3500 receives a small equipment update following the 2024 refresh, while its engines, transmission, exterior design, body structure and main cabin technology carry over.
What changed on the 2025 Sierra 3500 Pro?
The 2025 Sierra 3500 Pro gains standard cruise control and an integrated trailer brake controller. These additions expand its basic work-and-towing equipment without changing its V8 engines or 10-speed automatic transmission.
What changed on the 2025 Sierra 3500 AT4?
The 2025 Sierra 3500 AT4 makes adaptive cruise control with trailering and park assist standard rather than optional. Its standard 4WD, off-road suspension, Rancho shocks and skid plates continue.
What changed on the 2025 Sierra 3500 Denali?
The 2025 Sierra 3500 Denali makes adaptive cruise control with trailering standard rather than optional. The system adjusts its operation to account for the added weight and stopping distance of a connected trailer.
Did the 2025 Sierra 3500 get new engines or a new transmission?
No. The 2025 Sierra 3500 carries over its engines and 10-speed automatic transmission; the meaningful updates are added standard towing and driver-assistance equipment on selected trims.
2025 GMC Sierra 3500 Reviews
What owners are saying about the 2025 GMC Sierra 3500.
4.6
2025 GMC Sierra 3500
(22 reviews)
“GMC trucks are awesome! However, in the state of California, it would be nice to know beforehand that roof marker lamps are not available on single rear wheel drive trucks! The turning signal handle is a little mushy! I would prefer it to be much more crisp like the feeling I have with my other vehicles!”