Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1998 GMC Forward Control 7.4 BFACTORY OEM SERVICE PROCEDURE
Engine Controls - Specifications - 7.4L: Capacities
BATTERY SPECIFICATIONS
| Series | Cold Crank Amps @ 0Β°F (-18Β°C) | Reserve Capacity (Minutes) |
|---|---|---|
| G | 600 | 130 |
FLUID CAPACITY (CRANKCASE) (1)
| Application | (2) Quantity Qts. (L) | ||||
|---|---|---|---|---|---|
| 7.4L | 6.6 (6.3) | ||||
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FLUID CAPACITY (COOLING SYSTEM) (1)
| Application | (2) Quantity Qts. (L) | ||||
|---|---|---|---|---|---|
| With Rear Heater | 26.0 (24.6) | ||||
| Without Rear Heater | 23.0 (21.8) | ||||
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FLUID CAPACITY (AUTOMATIC TRANSMISSION) (1)
| Application | (2) Quantity Qts. (L) | ||||
|---|---|---|---|---|---|
| 4L60-E | 5.0 (4.7) | ||||
| 4L80-E | 7.7 (7.3) | ||||
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FLUID CAPACITY (MANUAL TRANSMISSION) (1)
| Application | Quantity Qts. (L) | ||||||
|---|---|---|---|---|---|---|---|
| NVG 3500 | (3) 2.2 (2.0) | ||||||
| NVG 4500 | (2) 4.0 (3.8) | ||||||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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