I own a 1970 plymouth ‘Cuda w/a 440 engine & a torqueflight 727 transmission. The trans has a leak in the rear

I thought the leak was from the trans pan gasket. I replaced the stock pan w/an alluminum tci trans pan & gasket. When I removed the pan, I found 3 bolt holes stripped out—I fixed this by installing thread inserts in order to keep original bolt size. I made sure the inserts were slightly recessed so pan & gasket could seal properly. After this repair; I filled trans & test drove car. afterwards; I checked & found no leaks. I then let car sit for several hours & every hour upon recheck, I still found no leaks until car had sat for about 4 hours: leak seemed to be from rear of trans pan again. Upon further inspection; found leak seems to be comming from just above the rt rear of trans pan from what looks like a plug of some sort in back of the main housing just below where the tail shaft housing bolts on. The plug (or whatever this is) is about the diameter of a dime. What is this? Has anyone seen this leak before? What can I do to seal this? Please advise.

The item you are referring to is the”stop rod” for the Low/Reverse Band. It is sealed with 2 O-rings. The only way to repair it is to remove the tail section of the transmission, the transmission pan and the Low/Reverse linkage, then pull the rod out. A lot of work for a small leak. Before I did all this work, I would try cleaning the area with Brake Cleaner and compressed air. Then put a blob of RTV silicone on it. There is no pressure there, so that may stop the leak. It’s worth a shot before tearing the transmission all apart! HTH!! Good Luck!!

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