batmanurd

sorry if there is a therad about this already. I'm bad at searching. this weekend I was helping a friend move. He had a flatbed trailer that needed to be brought back (a two hour trip). it was unloaded so I thought if I took it easy I'd be alright. I was wrong As I drove through a small town and had to slow down it started shifting up and down. I tried manualy shiffting down but it still wasn't right. I shifted into neutral and back into drive and then had nothing. I pulled over and trans fluid was leaking bad. i could't tell where (it was the middle of the night). Anyways, I had it towed home. I'm hoping I just blew a seal but that's why I'm writing this. Where should i start my search? I'm ok at working on things myself but I have limited tools/time.