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 MANUALSTOYOTA1988VAN BASE, VAN PASSENGERREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - A-43D/A-44D/A-45DF/A-45DLCOMPONENT DISASSEMBLY & REASSEMBLYOVERDRIVE BRAKEREASSEMBLY
1988 Toyota Van Base, Van Passenger
Overdrive Brake: Reassembly
1988 Toyota Van Base, Van PassengerSECTION Reassembly
- Lubricate and install oil seal rings on overdrive case, ensuring ring ends are hooked. After installing oil seal rings, ensure rings rotate smoothly. Install new "O" ring on overdrive brake piston. Carefully install piston with cup side upward.
- Install piston return springs. Install snap ring. Ensure end-gap of snap ring is not aligned with cutouts of case. ensure snap ring is inserted in its groove.
- Install thrust bearing and races on planetary ring gear with raised in proper direction. Install planetary ring gear assembly into clutch case.
- With the case open area facing upward, install cushion plate into case with rounded side inward. Install in order: plate, disc, plate, disc, plate, disc. Install flange with rounded edge facing upward. Install snap ring. ensure end-gap of snap ring is not aligned with cutouts of case.
- On A-43D and A-44D models, check overdrive brake piston stroke. Install overdrive case on transmission case with cutout portion of overdrive case facing upward side of transmission case. Ensure overdrive case oil hole is aligned with transmission case oil hole. Measure brake piston stroke by applying compressed air to oil hole. See Fig 1. Piston stroke should be .0256-.0870" (.650-2.210 mm). If piston stroke is less than specification, components may have been misassembled.
- On A-45DL and A-45DF models, measure brake pack clearance between snap ring and flange. Standard clearance should be .0256-.0870" (.650-2.210 mm). Clearance must be within specification. Install washer on ring gear. See Fig 2.
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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.