Over heating ?

Coming out the vent right above the seal?

The one time I overheated a trans it was coming out the filler tube also.

You sure that the trans was not just over full and fluid was expanding and coming out the vent

Tom ,

2011 Ram 3500 C&C Diesel
2009 Challenger R/T
1971 Challenger Conv. 511/4 speed
1970 Challenger R/T 503/727