1999-2006 GMC Sierra: Technical Specifications
Updated: 11/23/08
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Specs for this generation GMC Sierra include everything from fuel mileage to seating capacity to options availability.
Vehicle Dimensions
| Specification | ext. cab long bed | ext. cab short bed | reg. cab long bed | reg. cab short bed |
| Wheelbase, in. | 157.5 | 143.5 | 133.0 | 119.0 |
| Overall Length, in. | 246.6 | 227.5 | 222.1 | 203.2 |
| Overall Width, in. | 78.5 | 78.5 | 78.5 | 78.5 |
| Overall Height, in. | 70.8 | 71.2 | 71.0 | 71.2 |
| Curb Weight, lbs. | 4511 | 4289 | 4066 | 3956 |
| Cargo Volume, cu. ft. | -- | -- | -- | -- |
| Standard Payload, lbs. | -- | -- | -- | -- |
| Fuel Capacity, gals. | 34.0 | 26.0 | 34.0 | 26.0 |
| Seating Capacity | 6 | 6 | 3 | 3 |
| Front Head Room, in. | 41.0 | 41.0 | 41.0 | 41.0 |
| Max. Front Leg Room, in. | 41.0 | 41.0 | 41.3 | 41.3 |
| Rear Head Room, in. | 38.4 | 38.4 | -- | -- |
| Max. Rear Leg Room, in. | 33.7 | 33.7 | -- | -- |
|
Specifications Key: NA = not available; "--" = measurement does not exist. |
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Powertrain Options and Availability
Sierras had a standard 200-horsepower 4.3-liter V6. Two V8s were optional: 4.8 and 5.3 liters. Either a 5-speed manual or 4-speed automatic transmission could be installed, but the 5.3-liter V8 was automatic-only. For 2000, the 4.8-liter V8 grew from 255 to 270 horsepower, while the 5.3-liter increased from 270 to 285 hp. GMC introduced a 325-horsepower, 6.0-liter V8 for 2001, in the new performance-focused C3 pickup. Joining the 295-hp 5.3 for '05 is a high-output version with 310 hp available on short-bed 4WD extendeds. Denali uses a 6.0 with 345 hp, a 20 hp increase from 2004.
| Engines | cu. in |
Horse- power | Torque | Transmission: |
Consumer Guide Observed |
| ohv V8 | 4.8 / 294 | 255-270 | 285 | 5-speed manual: 16/20 4-speed automatic: 16/21 |
5-speed manual: -- 4-speed automatic: -- |
| ohv V8 | 5.3 / 325 | 270-310 | 315-325 | 4-speed automatic: 16/20 | 4-speed automatic: 12.6 |
| ohv V8 | 6.0 / 364 | 300-345 | 360-370 | 4-speed automatic: 11/14 | 4-speed automatic: -- |
| ohv V6 | 4.3 / 262 | 200 | 260 | 5-speed manual: 17/23 4-speed automatic: 16/20 |
5-speed manual: -- 4-speed automatic: -- |
|
Specifications Key: NA = not available; "--" = measurement does not exist. |
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Built In: Canada
Drive Wheels: longitudinal front-engine/rear- or 4-wheel drive
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