 
			| 2008 GMC Sierra 3500HD Specifications | |
|---|---|
| 2008 GMC Sierra 3500HD Sub Models | |
| Crew Cab 4x4 Dually | 3.6% | 
| Regular Cab 4x4 | 1.8% | 
| Regular Cab 4x4 Chassis Dump Truck | 5.5% | 
| Regular Cab Chassis Commercial | 1.8% | 
| SLE Crew Cab 4x4 | 5.5% | 
| SLE Crew Cab 4x4 Dually | 14.5% | 
| SLE Crew Cab Dually | 5.5% | 
| SLE Extended Cab 4x4 | 3.6% | 
| SLT Crew Cab | 1.8% | 
| SLT Crew Cab 4x4 | 10.9% | 
| SLT Crew Cab 4x4 Dually | 43.6% | 
| SLT Extended Cab 4x4 | 1.8% | 
| 2008 GMC Sierra 3500HD Engines | |
| 6.0 Liter OHV 16V VVT Vortec V8 | 3.6% | 
| 6.6 Liter DOHC 32V Duramax Turbo Diesel V8 | 96.4% | 
| 2008 GMC Sierra 3500HD Transmissions | |
| 6 Speed Automatic | 27.3% | 
| Allison 1000 6 Speed Automatic | 72.7% | 
| 2008 GMC Sierra 3500HD Colors | |
| Black Onyx | 16.4% | 
| Carbon Black Metallic | 1.8% | 
| Dark Crimson Red | 3.6% | 
| Fire Red | 5.5% | 
| Fleet Yellow | 1.8% | 
| Medium Brown Metallic | 5.5% | 
| Midnight Blue Metallic | 1.8% | 
| Silver Birch Metallic | 16.4% | 
| Stealth Gray Metallic | 1.8% | 
| Steel Gray Metallic | 12.7% | 
| Summit White | 32.7% | 
| 2008 GMC Sierra 3500HD Interiors | |
| Dark Titanium | 9.1% | 
| Dark Titanium/Light Titanium | 29.1% | 
| Ebony | 43.6% | 
| Ebony/Light Cashmere | 1.8% | 
| Very Dark Cashmere/Light Cashmere | 16.4% |