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/TRANSAXLESERVICE AND REPAIRPROCEDURES4L60 (700-R4) AUTOMATIC TRANSMISSIONSERVO ASSEMBLY REPLACE
1986 Chevrolet C 10 P/U 2WD V8-350 5.7L
Servo Assembly Replace
1986 Chevrolet C 10 P/U 2WD V8-350 5.7LSECTION Servo Assembly Replace
1. Disconnect battery ground cable, then raise and support vehicle and remove oil pan.
2. Install tool No. J-29714, then remove 2-4 servo cover retaining ring 'using a small screwdriver.
3. Remove servo cover and O-ring using suitable tool.
4. Remove fourth gear apply piston and O-ring, then the second servo piston assembly.
5. Remove inner servo piston assembly oil seal and spring.
6. Reverse procedure to install. Whenever any servo parts are replaced, apply-pin length must be checked. Refer to step 5 in "Transmission Disassemble."
2. Install tool No. J-29714, then remove 2-4 servo cover retaining ring 'using a small screwdriver.
3. Remove servo cover and O-ring using suitable tool.
4. Remove fourth gear apply piston and O-ring, then the second servo piston assembly.
5. Remove inner servo piston assembly oil seal and spring.
6. Reverse procedure to install. Whenever any servo parts are replaced, apply-pin length must be checked. Refer to step 5 in "Transmission Disassemble."
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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.