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This ring can be a little tricky to get off. A set of pliers made for lock rings can really come in handy.
Tip: Once you get the ring out of the groove, if you have trouble getting it off the output shaft you can put the housing in a vise and tap the output shaft out. The lock ring should come right off.
Finish removing the output shaft.
Remove the band plunger through the inside of the transmission. Insert the bolt back in the clevis and tap it through with a hammer. Then remove the bolt and finish pulling the plunger through from the inside of the transmission housing.
Note: If you are not planning on replacing the o-rings on the clevis then you don’t want to push the plunger through on the inside. Once the o-rings and plunger come out of the hole the hole in the housing, they will get torn trying to go back in because that is a sharp edge. They have to be installed on the outside of the transmission and pushed to the inside where the edge is beveled.
If you are going to change a band, you will need to remove the pin that holds the band to the clevis. Then the band will slide out. You can do this once the band and plunger assembly is removed from the transmission housing but here is a picture of the pin just for reference.
Take out the other plunger and remove the band from the transmission.
When I pulled my output shaft, the oil seal came off with it. Most of the time this does not happen. So the next step is to remove the main output shaft oil seal. Usually a small screwdriver can do the trick. Just be careful not to damage the housing.
Once the oil seal is out you now have to remove a large lock ring that holds the bearing in place. Utilize the same pliers as before and walk it out of the housing.
The bearing is now free to come out.
Remove the main housing gasket.
Now you need to clean the housing good. Be sure to remove all of the old gasket. Also where the output shaft oil seal goes be sure to remove any remnants of the old seal. I find a razor blade to be the most effective but you have to be careful not to damage the surface.
If you are just replacing seals, now is a good time to check your brake bands. Make sure they have a uniform thickness and no cracks anywhere. Usually if you have problems you will immediately know it because one band will look much different than the other.
Remove the o-rings from the plungers and the shift lever. Be careful again not to damage the surface of the plunger. If you scratch it, it can be detrimental to the performance and seal of that plunger.
So far, so good. We are half way through the disassembly so don’t give up now. Let’s start on the other half of the T20 transmission with the center housing plate still attached.
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