Crazy Tranny Leak

[Kilgore Trout]

Last winter my Mustang was leaking about 1 drop per day of tranny fluid from the rear of the transmission.

It did not do it all summer...

Now it is back...

I guess it only leaks when the temp starts getting colder...?

Does anyone know how hard/expensive it is to replace the seal that is leaking at the rear of the automatic transmission?

 

[1LowGT]

is it where the driveshaft goes in? if so then the seal is the tailshaft seal and its easy to replace and cheap too,i use a seal puller and a rubber hammer to reinstall it