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 & REASSEMBLYGOVERNORDRIVEN GEAR REPLACEMENT
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40
Driven Gear Replacement
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40SECTION Driven Gear Replacement
- Drive out gear retaining split pin. Support assembly on 3/16" plates installed in exhaust slots of sleeve. Using a press, press gear out of sleeve with long punch. Clean governor sleeve of chips.
- To install new gear, press gear into sleeve until nearly seated. Remove any chips that may have been shaved off gear. Press gear in until bottomed on shoulder.
- New pin hole must be drilled through sleeve and gear. Support governor in press. Locate hole position 90 degrees from existing hole. Center punch and drill new hole through sleeve and gear with 1/8" drill bit. Install new pin.
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.