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| 2008 GMC Sierra 1500 Extended Cab | 2007 GMC Sierra Extended Cab | |
| Price Range | $22,915 - $36,060 | |
| Engine(s) | 4.3l V6, 4.8l V8, 5.3l V8, 6.0l V8 | 4.8l V8 |
| Transmission(s) | A4 | A4 |
| Driven Wheels | 4WD, RWD | 4WD, RWD |
| Length / Width / Height | 230.2 / 79.9 / 73.9 | 230.2 / 79.9 / 73.9 |
| Curb Weight (lbs.) | 4797 - 5265 | 4797 - 5265 |