1981–1990 GMC Forward Control
Common problems, technical service bulletins, fluid specs and labor times — verified for your car.
Top Problems (5)
Faulty Fuel Pump
high
Faulty Clutch
high
Faulty Ignition Switch
medium
Worn Brake Pads
low
Active Service Bulletins
73-12-13 — PUREGUARD 2 Operating Alert (73-12-13)
Quick Lookups
— Circuit Description
Engine Performance
— Possible Causes & Corrections
Engine Performance
— Ultrasonic Inspection
General Information
— Diagnostic Procedures
Engine Performance
Key Fluid Specs
| Spec | Value |
|---|---|
| Pickup & Sierra | (3) 8.0 |
| Crew Cab & Utility | (3) 8.0 |
| With Rear Unit | (3) 11.0 |
| Without Rear Unit | (3) 8.0 |
| With Rear Unit | (3) 11.0 |
| Without Rear Unit | (3) 8.0 |
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