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 MANUALSCHEVROLET1985STEP VAN P30, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400TRANSMISSION REASSEMBLYREAR BAND & GEAR UNIT
1985 Chevrolet Step Van P30, 5.7 M, Automatic, 400/M40
Rear Band & Gear Unit
1985 Chevrolet Step Van P30, 5.7 M, Automatic, 400/M40SECTION Rear Band & Gear Unit
- Install rear band assembly so 2 lugs index with 2 anchor pins. Ensure band is seated on lugs. Install previously selected rear unit end play washer into slots provided inside rear of case. See REAR UNIT END PLAY CHECK . Place transmission case in horizontal position in holding tool.
- Install complete gear unit assembly into case by lining up slots. Carefully guide assembly into case. Make sure center support bolt hole is aligned with hole in case.
- Position transmission vertically with front end of case up. Install center support-to-case snap ring with beveled side up and flat side against center support. Locate gap adjacent to front band anchor pin. Expand snap ring until center support is against shoulder of case.
- Install case-to-center support bolt. Carefully pry with punch to align bolt hole. Use care not to burr case valve body mounting surface. Lubricate intermediate clutch plates with transmission fluid. Start with waved steel plate. Alternate composition and flat steel plates until all clutch plates are installed.
- Lubricate intermediate clutch plates with transmission fluid. Start with waved steel plate. Alternate composition and flat steel plates until all clutch plates are installed. Install intermediate clutch backing plate and snap ring.
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.