Editing TH400 rebuild tech (section)
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===Shift shaft seal replace=== After you have disassembled your trans and cleaned the mostly bare case, I recommend you change the shift shaft seal, kick down connector O-ring, and rear case bushing. Pictured here is a tool that allows removing the shift shaft seal without removal of the parking linkage. It is relatively inexpensive and can be used without pan removal with the transmission in the car. Be sure to lube the seal before re-installing, and take care not to cut it on the edges of the shifter shaft. If you do not have the tool or wish to buy it, now is DEFINITELY the time to change the seal, it requires removal of the linkage. You want to do this before you have the trans internals assembled. If you drop the "nail" in the case, or anything else, it is very frustrating later on to disassemble. [[file:Shift_seal_tool.jpg]] <br><br>
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