1990-1998 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. | 155.5 | 141.5 | 131.5 | 117.5 |
| Overall Length, in. | 237.1 | 218.4 | 213.4 | 194.5 |
| Overall Width, in. | 76.8 | 76.8 | 76.8 | 76.8 |
| Overall Height, in. | 74.9 | 70.4 | 70.4 | 70.4 |
| Curb Weight, lbs. | 7387 | 4140 | 4001 | 3849 |
| Cargo Volume, cu. ft. | -- | -- | -- | -- |
| Standard Payload, lbs. | 5040 | 3260 | 5380 | 2410 |
| Fuel Capacity, gals. | 34.0 | 34.0 | 34.0 | 25.0 |
| Seating Capacity | 6 | 6 | 3 | 3 |
| Front Head Room, in. | 40.0 | 40.0 | 40.0 | 40.0 |
| Max. Front Leg Room, in. | 41.7 | 41.7 | 41.7 | 41.7 |
| Rear Head Room, in. | 37.5 | 37.5 | -- | -- |
| Max. Rear Leg Room, in. | 34.8 | 34.8 | -- | -- |
|
Specifications Key: NA = not available; "--" = measurement does not exist. |
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Powertrain Options and Availability
Base engine in most models was a 4.3-liter V6, rated at 160 horsepower. Three gasoline engines were available: 5.0, 5.7, and 7.4 liters, making 175, 210, and 230 horsepower, respectively. The 7.4-liter V8 was limited to heavy-duty C/K 2500 models. Also available: a 6.2-liter diesel, at 140 horsepower. The 4.3 V6 gained five horsepower for 1993. A C/K 2500 rated over 8500 pounds GVW could have a heavy-duty V6 with slightly less power, modified for hard use. By 1994, twin 6.5-liter diesels ousted the prior 6.2-liter, available with or without turbocharging. Horsepower got a big boost for '96, as V6 and V8 engines adopted a Vortec designation. The normally aspirated diesel disappeared, but the turbodiesel remained available. A 5-speed manual gearbox was standard on most models, though earlier examples might have a 4-speed. A 4-speed automatic transmission was optional. Insta-Trac part-time 4WD had automatic-locking hubs and shift-on-the-fly capability.
| Engines | cu. in |
Horse- power | Torque | Transmission: |
Consumer Guide Observed |
| ohv V8 | 7.4 / 454 | 230-290 | 285-410 | 4-speed automatic: 10/12 | 4-speed automatic: -- |
| Turbodiesel ohv V8 | 6.5 / 400 | 180-190 | 360 | 4-speed automatic: 16/21 | 4-speed automatic: -- |
| ohv V6 | 4.3 / 262 | 160-200 | 235-255 | 4-speed manual: 18/20 5-speed manual: 17/22 4-speed automatic: 17/22 |
4-speed manual: -- 5-speed manual: -- 4-speed automatic: -- |
| ohv V8 | 5.0 / 305 | 175-230 | 270-285 | 5-speed manual: 15/20 4-speed automatic: 15/19 |
5-speed manual: -- 4-speed automatic: 14.5 |
| ohv V8 | 5.7 / 350 | 200-255 | 300-335 | 4-speed manual: 13/16 5-speed manual: 14/20 4-speed automatic: 15/19 |
4-speed manual: -- 5-speed manual: -- 4-speed automatic: 13 |
| Diesel ohv V8 | 6.2 / 379 | 140 | 255 | 4-speed manual: 19/21 4-speed automatic: 18/24 |
4-speed manual: -- 4-speed automatic: -- |
| Diesel ohv V8 | 6.5 / 400 | 155 | 255 | 5-speed manual: 19/23 4-speed automatic: 17/22 |
5-speed manual: -- 4-speed automatic: -- |
|
Specifications Key: NA = not available; "--" = measurement does not exist. |
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Built In: Canada, USA
Drive Wheels: longitudinal front-engine/rear- or 4-wheel drive
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