2026 GMC Sierra 3500HD SLT
Unverified
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 2026 GMC Sierra 3500HD SLT is a 401-hp 6.6-liter V8 with an allison 10-speed automatic and four-wheel drive. It starts at $65,900 MSRP.
It makes 401 horsepower at 5,200 rpm and 464 lb-ft of torque at 4000 rpm.
The Sierra 3500HD measures 250.8 inches long on a 159.0-inch wheelbase and has a curb weight of 7,417 lb.
| Spec | Value |
|---|---|
| Vehicle | |
| Body Type | Pickup |
| Powertrain | Gas |
| Price | |
| MSRP | $65,900 |
| MSRP with Destination | $68,695 |
| Destination Charge | $2,795 |
| Engine | |
| Engine Type | 6.6L V8 OHV VVT |
| Displacement | 6.6 L |
| Horsepower | 401 hp @ 5,200 rpm |
| Torque | 464 lb-ft @ 4000 rpm |
| Valvetrain | OHV, 16 valves, VVT |
| Injection Type | Direct injection |
| Drivetrain | |
| Drive Type | 4WD |
| Transmission | |
| Transmission | Allison 10-speed Automatic |
| Fuel Economy | |
| Recommended Fuel | Regular Unleaded |
| Tank Capacity | 36 gal |
| Suspension | |
| Front Suspension | Independent, stabilizer bar |
| Brakes | |
| Front Brake Calipers | Ventilated Disc |
| Front Brake Disc | Ventilated disc |
| Rear Brake Disc | Ventilated disc |
| Dimensions & Weight | |
| Length | 250.8 in |
| Width | 81.9 in |
| Height | 81.2 in |
| Wheelbase | 159 in |
| Ground Clearance | 11.2 in |
| Curb Weight | 7,417 lbs |
| Interior | |
| Headroom Front | 43 in |
| Headroom Rear | 40.1 in |
| Legroom Front | 44.5 in |
| Legroom Rear | 43.4 in |
| Shoulder Room Front | 66 in |
| Shoulder Room Rear | 65.3 in |
| Hip Room Front | 61.2 in |
| Hip Room Rear | 60.2 in |
Similar cars
Rivals to the 2026 GMC Sierra 3500HD SLT with similar size, power and price from around the same years.
Safety & Recalls
NCAP safety ratings
Not crash-tested by NHTSA for this model year.
Recalls
2 recalls on file with NHTSA for the 2026 GMC SIERRA 3500. Not every recall applies to every trim or VIN — check yours at nhtsa.gov/recalls.
Mar 5, 2026 · FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP:CONTROL/DRIVE MODULE
General Motors, LLC (GM) is recalling certain 2025-2026 Chevrolet Silverado 3500, and GMC Sierra 3500 vehicles with gasoline engines and dual fuel tanks (RPOs L8T and N2N). The rear fuel pump may not transfer adequate fuel to the front tank, causing an engine stall.
Consequence: An engine stall increases the risk of a crash.
Remedy: The vehicle's engine control module (ECM) will be updated by a dealer or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed April 8, 2026. Owners may contact GMC customer service at 1-800-462-8782 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262544420. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on March 5, 2026.
NHTSA campaign 26V129000
Feb 26, 2026 · EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
General Motors has decided that certain 2027 Chevrolet Bolt EV, 2025-2026 Cadillac OPTIQ, Chevrolet Colorado, Equinox EV, GMC Canyon, 2026 Buick Enclave, Envision, Cadillac CT5, Escalade, Escalade ESV, Escalade IQ, Escalade IQL, LYRIQ, VISTIQ, Chevrolet Blazer EV, Corvette Convertible, Corvette Coupe, Corvette Convertible E-Ray, Equinox, Silverado 1500, 2500, 3500, Silverado EV, Suburban 1500, Tahoe, Traverse, GMC Acadia, Hummer EV Pickup, Hummer EV SUV, Sierra 1500, 2500, 3500, Sierra EV, Terrain, Yukon, and Yukon XL vehicles. The radio may not have been set to the correct status to download the electronic owner's manual during production. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, “Occupant Protection.”
Consequence: Without an owner's manual to consult, owners may not know how to safely use and operate the vehicle, increasing the risk of injury in a crash.
Remedy: Dealers will reset the vehicle radio, which will facilitate automatic download of the electronic owner’s manual, free of charge. Owner notification letters were mailed April 16, 2026. Owners may contact GM customer service at 1-866-467-9700, Chevrolet customer service at 1-800-222-1020 or Cadillac customer service at 1-800-333-4223. The manufacturer's number for this recall is N252540430. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on February 26, 2026.
NHTSA campaign 26V114000
5 owner complaints to NHTSA for the 2026 GMC SIERRA 3500
Owner Complaints
5 owner complaints filed with NHTSA for the 2026 GMC SIERRA 3500. See all on nhtsa.gov
| Power Train | 2 |
| Wheels | 2 |
| Electrical System | 1 |
| Fuel/Propulsion System | 1 |
| Hydraulic | 1 |
| Service Brakes | 1 |
Complaints are unverified reports submitted to NHTSA by owners. They cover the whole model year, not a specific trim, and a count alone doesn't show how common a problem is.
Source: US National Highway Traffic Safety Administration (nhtsa.gov), matched as 2026 GMC SIERRA 3500. US-market vehicles only; data cached for up to 7 days.