Model Research
New 2026 GMC
Sierra 3500 HD
The Sierra HD 3500’s standard 6.6L V8 gas engine is paired with the Allison 10-speed automatic transmission, to help optimize power, torque, and efficiency.
Every GMC Sierra 3500 HD truck includes active safety and driver assistance technologies that help while driving and trailering.
LED projector headlamps with striking animated sequences help enhance Sierra Heavy Duty’s impressive exterior design.
The available 15" diagonal Head-Up Display helps keep important information like speed and alerts in clear view.
Specs
Starting MSRP
$47,900
Combined MPG
TBD
Engine
6.6L V8 Gas
Transmission
Allison® 10-speed Automatic
Drive
2WD or 4WD
Seats
6
2026 GMC Sierra 3500 HD image 1
2026 GMC Sierra 3500 HD image 2
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Trims
| Trim | Inventory Prices | MPG | Engine | Transmission | Drive |
|---|---|---|---|---|---|
| Pro | Starting at $52,295 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 2WD or 4WD |
| SLE | Starting at $57,295 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| SLT | Starting at $68,495 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| AT4 | Starting at $73,395 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| Denali | Starting at $78,695 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| Denali Ultimate | Starting at $99,795 | Combined MPG TBD | 6.6L Duramax Turbo-Diesel V8 | Allison® 10-speed Automatic | 4WD |