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.
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HOMESERVICE MANUALSCHEVROLET1987R 30 P/U 2WD V8-379 6.2L DSLREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLESERVICE AND REPAIROVERHAUL700-R4 AUTOMATIC TRANSMISSIONCASE & INTERNAL COMPONENTSCASE ASSEMBLY INSPECTION
1987 Chevrolet R 30 P/U 2WD V8-379 6.2L DSL
Case Assembly Inspection
1987 Chevrolet R 30 P/U 2WD V8-379 6.2L DSLSECTION Case Assembly Inspection
1. Inspect case exterior for cracks or porosity.
2. Inspect case to valve body face for damage, interconnected oil passages and flatness.
3. Inspect vent assembly for damage.
4. Inspect 2-4 servo bore for damage, porosity or burrs, Fig. 23.
5. Inspect orifice cup plug in servo bore for debris or damage.
6. Inspect 3rd accumulator bore for porosity, damage and burrs.
7. Inspect 3rd accumulator bore for plugged or damaged orifice cup plug, Fig. 24.
8. Inspect speedometer bore for damage, sharp edges or porosity.
9. Inspect all bolt holes and cooler connections for thread damage.
10. Inspect case interior for damaged ring grooves, worn or damaged clutch plate lugs and scored or worn bushings.
11. Inspect governor support pin installation depth as shown in Fig. 25.
2. Inspect case to valve body face for damage, interconnected oil passages and flatness.
3. Inspect vent assembly for damage.
Fig. 23, Servo bore:
4. Inspect 2-4 servo bore for damage, porosity or burrs, Fig. 23.
5. Inspect orifice cup plug in servo bore for debris or damage.
6. Inspect 3rd accumulator bore for porosity, damage and burrs.
Fig. 24, 3rd accumulator bore:
7. Inspect 3rd accumulator bore for plugged or damaged orifice cup plug, Fig. 24.
8. Inspect speedometer bore for damage, sharp edges or porosity.
9. Inspect all bolt holes and cooler connections for thread damage.
10. Inspect case interior for damaged ring grooves, worn or damaged clutch plate lugs and scored or worn bushings.
Fig. 25, Governor pin location:
11. Inspect governor support pin installation depth as shown in Fig. 25.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.