I am trying to narrow down a leak in my 727. It has a new aluminum pan with the new style gasket so i think we have ruled that out... I was under the car today, cleaned everything on the tranny that I could then drove it and got it all warmed up... After that i had it back in the air to watch for leaks. The picture below shows a core tranny that i had at my shop. It seems to me like it is something like a soft plug or something at the back passenger lower side. It looks like the tail housing has an ear that possibly keeps this piece from coming out. There is a little depression under this and it seems to hold a little fluid and then runs down on to the gasket and pan. In the core tranny it is set about an 1/8"... in mine it is flush out to the edge and seems to be resting on the ear of the tail shaft housing. Can i set mine back in place with a punch to stop the leaking and what is it?

Thank you,
Matt

The item you have marked, is the rear band pivot pin. It is sealed by an "O" ring (2 on some pins). Pressing it further into the case will not stop a leak. The "O" ring is far enough inside the trans, that it should not leak, even if the pin is against the tail shaft housing tab. The tab on the tail shaft housing is there to retain the pin. Its a simple procedure to replace the "O" ring(s).

Try to tap it in a little, clean with brake kleen, give it a shot of compressed air & cover recess with ultra gray silicone. Let it cure for 24 hrs. Should be ok after that.

You can try to remove all the tail housing bolts out, tap the tail housing loose(if you are lucky the gasket won't tear) You dont need to remove the tail housing, only rotate it out of the way of the pin. There is a threaded hole that you can use to pull the pin. If you pull it all the way out, you will need to go back into the pan, because the band arm will fall out. If you only pull the pin far enough to get at the o ring, you should be ok.

No threaded hole in most, gotta push the pin out from inside.

The RTV on the outside usually works if the fluid doesn't continue to leak as you're applying the RTV...drain pan half way or jack the rear of the car real high.