I apologize in advance about the long post. I have a 1965 mustang with the 6 cylinder motor and C4 (early model) automatic transmission. I just rebuild the transmission with new gaskets, friction plates, bearings and TC. I put the Trans in the car and it drove and shifted fine, it did leak but not very much. I went on a trip for a week and when I came back there was a good 2 square feet of transmission fluid on the floor. When I looked at the ttransmission, it looked to me like it is leaking from between the transmission bel housing and transmission case. I am not sure why it is leaking from that spot. People say that it could be the pump gasket but for one, the transmission is leaking at a stand still and secondly I just put new gaskets in. Any suggestions are greatly appreciated!