TH400 rebuild tech
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Be sure to lube the seal before re-installing, and take care not to cut it on the edges of the shifter shaft. | Be sure to lube the seal before re-installing, and take care not to cut it on the edges of the shifter shaft. | ||
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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. | 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. | ||
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| + | [[file:Shift_seal_tool.jpg]] | ||
A universal cam bearing tool can be used to replace many bushings in the various automatics. It will not do very small bushings. Pictured here driving the bushing out towards the front. | A universal cam bearing tool can be used to replace many bushings in the various automatics. It will not do very small bushings. Pictured here driving the bushing out towards the front. | ||
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| + | [[file:Rearbushingdriver.jpg]] | ||
A TH400 and 4L80-E used in heavy towing will sometimes cause the rear bushing to "walk" to the rear, ruining the governor gear. There is a "fix" bushing for this that has a thrust surface on the front that prevents the bushing from walking. | A TH400 and 4L80-E used in heavy towing will sometimes cause the rear bushing to "walk" to the rear, ruining the governor gear. There is a "fix" bushing for this that has a thrust surface on the front that prevents the bushing from walking. | ||
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