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 MANUALSCHEVROLET1986C 10 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLETESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURES4L60 (700-R4) AUTOMATIC TRANSMISSIONSLIPS IN 1ST GEAR
1986 Chevrolet C 10 P/U 2WD V8-350 5.7L
Slips In 1ST Gear
1986 Chevrolet C 10 P/U 2WD V8-350 5.7LSECTION Slips In 1ST Gear
1. Forward clutch assembly plates worn.
2. Porosity or damage in forward clutch piston.
3. Forward clutch piston inner and outer seals missing, cut or damaged.
4. Input housing to forward clutch housing O-ring seal missing, cut or damaged.
5. Forward clutch housing damaged.
6. Forward clutch housing retainer and ball assembly not sealing or damaged.
7. Turbine shaft seals missing, cut or damaged.
8. Valve body accumulator valve stuck
9. Valve body face not flat, damaged lands or interconnected passages.
10. Valve body spacer plate or gaskets incorrect, damaged or incorrectly assembled.
11. T.V. cable binding or broken.
12. Damaged ring grooves on 1-2 accumulator piston.
13. 1-2 accumulator piston seal missing, cut or damaged.
14. 1-2 accumulator cover gasket missing or damaged.
15. Leak between 1-2 accumulator piston and pin.
16. Broken 1-2 accumulator spring.
17. Fourth servo piston installed backwards.
18. Incorrect oil pressure. Refer to "High or Low Oil Pressure."
2. Porosity or damage in forward clutch piston.
3. Forward clutch piston inner and outer seals missing, cut or damaged.
4. Input housing to forward clutch housing O-ring seal missing, cut or damaged.
5. Forward clutch housing damaged.
6. Forward clutch housing retainer and ball assembly not sealing or damaged.
7. Turbine shaft seals missing, cut or damaged.
8. Valve body accumulator valve stuck
9. Valve body face not flat, damaged lands or interconnected passages.
10. Valve body spacer plate or gaskets incorrect, damaged or incorrectly assembled.
11. T.V. cable binding or broken.
12. Damaged ring grooves on 1-2 accumulator piston.
13. 1-2 accumulator piston seal missing, cut or damaged.
14. 1-2 accumulator cover gasket missing or damaged.
15. Leak between 1-2 accumulator piston and pin.
16. Broken 1-2 accumulator spring.
17. Fourth servo piston installed backwards.
18. Incorrect oil pressure. Refer to "High or Low Oil Pressure."
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.