2025 GMC Sierra 3500HD SLT
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Photo: 2020 GMC Sierra 2500 Denali HD, Duramax 6.6L, front 2.1.20 by Kevauto, CC BY-SA 4.0, via Wikimedia Commons
Photo: 2023 GMC Sierra 2500 Denali HD Ultimate in Titanium Rush Metallic, front right by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons
Photo: 2020 GMC Sierra 2500 Denali HD, Duramax 6.6L, rear 2.1.20 by Kevauto, CC BY-SA 4.0, via Wikimedia Commons
Photo: 2023 GMC Sierra 2500 Denali HD Ultimate in Titanium Rush Metallic, rear left by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons
Photos show the fifth generation (T1 (GMTT1XX), 2020–present); trim, color, and model year may differ.
All photo credits
- Photo: 2020 GMC Sierra 2500 Denali HD, Duramax 6.6L, front 2.1.20 by Kevauto, CC BY-SA 4.0, via Wikimedia Commons
- Photo: 2023 GMC Sierra 2500 Denali HD Ultimate in Titanium Rush Metallic, front right by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons
- Photo: 2020 GMC Sierra 2500 Denali HD, Duramax 6.6L, rear 2.1.20 by Kevauto, CC BY-SA 4.0, via Wikimedia Commons
- Photo: 2023 GMC Sierra 2500 Denali HD Ultimate in Titanium Rush Metallic, rear left by Ethan Llamas, CC BY-SA 4.0, via Wikimedia Commons
The 2025 GMC Sierra 3500HD SLT is a 401-hp 6.6-liter with an allison 10l1000 10-speed automatic and rear-wheel drive. It starts at $63,100 MSRP.
It makes 401 horsepower and 464 lb-ft of torque.
The Sierra 3500HD measures 250.8 inches long on a 158.9-inch wheelbase and has a curb weight of 7,151 lb.
| Spec | Value |
|---|---|
| Vehicle | |
| Body Type | Pickup |
| Powertrain | Gas |
| Price | |
| MSRP | $63,100 |
| MSRP with Destination | $65,295 |
| Destination Charge | $2,195 |
| Engine | |
| Engine Type | 6.6L V-8 Gasoline (FlexFuel) |
| Displacement | 6.6 L |
| Horsepower | 401 hp |
| Torque | 464 lb-ft |
| Valvetrain | OHV, 2 valves/cyl, VVT (gas) |
| Bore and Stroke | 103.25 x 98 (gas) |
| Compression Ratio | 10.8:1 (gas) |
| Injection Type | Direct fuel injection (gas) |
| Drivetrain | |
| Drive Type | RWD |
| Transmission | |
| Transmission | Allison 10L1000 10-speed automatic |
| 1st Gear | 4.54 |
| 2nd Gear | 2.87 |
| 3rd Gear | 2.06 |
| 4th Gear | 1.72 |
| 5th Gear | 1.48 |
| 6th Gear | 1.26 |
| 7th Gear | 1 |
| 8th Gear | 0.85 |
| 9th Gear | 0.69 |
| 10th Gear | 0.63 |
| Reverse | 4.54 |
| Final Drive | 3.73 |
| Fuel Economy | |
| Recommended Fuel | Regular gasoline |
| Suspension | |
| Front Suspension | Short/long-arm independent front suspension with torsion bars |
| Rear Suspension | Semi-elliptic three-stage multi-leaf springs |
| Brakes | |
| Front Brake Disc | 14 x 1.6 in / 355 x 40 mm |
| Rear Brake Disc | 14.1 x 1.3 in / 360 x 34 mm (SRW) / 14 x 1.6 in / 355 x 40 mm (DRW) |
| Tires & Wheels | |
| Tires Front | LT275/70R18E – LT275/65R20E (SRW); LT235/80R17E – LT235/80R18E (DRW) |
| Tires Rear | LT275/70R18E – LT275/65R20E (SRW); LT235/80R17E – LT235/80R18E (DRW) |
| Dimensions & Weight | |
| Length | 250.75 in |
| Width | 81.85 in |
| Height | 80.87 in |
| Wheelbase | 158.94 in |
| Front Track | 68.1 in |
| Rear Track | 68.3 in |
| Ground Clearance | 11.18 in |
| Curb Weight | 7,151 lbs |
| Interior | |
| Headroom Front | 43.03 in |
| Headroom Rear | 40.12 in |
| Legroom Front | 44.53 in |
| Legroom Rear | 43.4 in |
| Shoulder Room Front | 66.02 in |
| Shoulder Room Rear | 65.3 in |
| Hip Room Front | 61.18 in |
| Hip Room Rear | 60.24 in |
Similar cars
Rivals to the 2025 GMC Sierra 3500HD SLT with similar size, power and price from around the same years.
Safety & Recalls
No NHTSA data available for the 2025 GMC Sierra 3500HD.
Source: US National Highway Traffic Safety Administration (nhtsa.gov). US-market vehicles only; data cached for up to 7 days.