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 400COMPONENT DISASSEMBLY & REASSEMBLYCONTROL VALVE ASSEMBLYINSPECTION
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40
Control Valve Assembly: Inspection
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40SECTION Inspection
Clean and inspect all parts. If burrs are present on valves, remove with a fine stone. Use care not to round off shoulders of valves. Ensure valves slide freely by their own weight.
NOTE:
DO NOT
remove Teflon oil seal from front accumulator piston unless seal ring needs replacing. Service oil seal ring is cast iron.
RENDER: 1.0x
NO RELATED
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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.