i recently put a used trans in my car and evry once in a while itl pour out about a quart of trans fluid ovr night i thought maybe it was overfull and it just overflowed when it got hot but its even done it when i move it around the yard what else could it be?

 

Dipstick tube not in all the way or the O-ring is missing on it

 

You didn't say what year, but between the speedo cable housing and the hole in the tail is a common place to leak.