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 MANUALSCHEVROLET1983STEP VAN P20, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400TRANSMISSION REASSEMBLYREAR SERVO
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40
Rear Servo
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40SECTION Rear Servo
- Before installing servo, check band apply pin. See BAND APPLY PIN SELECTION CHECK under FRONT & REAR SERVO ASSEMBLY under TRANSMISSION DISASSEMBLY. Ensure rear band apply lug is aligned with servo pin bore in transmission case.
- Lubricate servo bores with transmission fluid. Install rear accumulator spring in servo inner bore. Install rear servo assembly. Ensure it seats properly in bore. With servo depressed, install gasket and cover. Tighten attaching bolts.
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.