Model Research
New 2026 GMC
Sierra 2500 HD
Sierra Heavy Duty’s available Duramax 6.6L Turbo-Diesel V8 engine features an efficient turbocharger and Allison 10-speed automatic transmission.
Stand out everywhere you go with GMC Sierra HD Denali’s iconic chrome grille, front bumper and fascia.
The 2025 Sierra Heavy Duty offers more trailering-assistance technologies than any competitor in its class, so you can trailer with confidence.
Experience serious comfort in Sierra Heavy Duty’s available best-in-class 16-way power front seats with massaging feature.
Specs
Starting MSRP
$46,700
Combined MPG
TBD
Engine
6.6L V8 Gas
Transmission
Allison® 10-speed Automatic
Drive
2WD or 4WD
Seats
6
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Trims
| Trim | Inventory Prices | MPG | Engine | Transmission | Drive |
|---|---|---|---|---|---|
| Pro | Starting at $46,700 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 2WD or 4WD |
| SLE | Starting at $53,500 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| SLT | Starting at $64,700 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| AT4 | Starting at $71,600 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| AT4X | Starting at $83,700 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| Denali | Starting at $75,000 | Combined MPG TBD | 6.6L V8 Gas | Allison® 10-speed Automatic | 4WD |
| Denali Ultimate | Starting at $93,800 | Combined MPG TBD | 6.6L Duramax Turbo-Diesel V8 | Allison® 10-speed Automatic | 4WD |