65 Mustang leaking trans fluid

dennis112 said:

Since you verified that it is indeed ATF then it is most likely the seal at the front of the transmission that seals the torque converter snout to the transmission. Typically one replaces it when the have the motor out as an insurance policy against leaks. The seal is the small shiny area surrounding the input shaft in this photo:



Unfortunately replacement will require dropping the transmission to remove the torque converter in order to get to the seal that is installed on the transmission. The seal is fairly inexpensive and the work is not too difficult as all you need to do is remove the old seal that surrounds the front transmission shaft and reinstall a new one. If you are mechanically inclined and don't mind the labor, its not a big deal. If you are concerned about whether the new seal is installed correctly it it could be done at a shop in just a few minutes if you cart the transmission to them. You should also know how to "key" the torque converter back on the transmission before reinstalling the transmission. Its easy and the tranny shop can show you how to do it.

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dennis112 said:

I suppose that a converter plug could be loose if it has one, but as far as replacing the seal by moving the tranny backwards it isn't going to be the least bit easy. Remember that the converter has to come down before anything else can be done. The tranny can't go back that far without hitting the upper part of the transmission support. Also I don't know if the seal can be put in correctly with so little working room. I'd say that it would be best to plan on dropping it to the ground from the get-go.

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