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 & REASSEMBLYGOVERNORINSPECTION
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40
Component Disassembly & Reassembly: Governor: Inspection
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40SECTION Inspection
- Wash all parts in solvent and air dry. Blow out all passages. Inspect sleeve for wear or damage. Check for free operation in case bore. Check driven gear for looseness on sleeve.
- Ensure valve opening at entry and exhaust is .020" (.51 mm) minimum. Valve opening measurements are made with driven gear up and thrust cap down. Entry measurement is made with weights extended while exhaust is measured with weights inward.
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.