99 explorer 4x4 with 4.0 sohc 200+ thousand miles Transmission stopped working with my mother-in-law and she pulled over. She said there was a ton of fluid behind her on the road and also at the pull over spot. I put three quarts in it and it only made it about a mile or so before it started pouring out between the engine and the transmission hitting the exhaust and catalytic converter on it's way to the ground. What could it be, we plan on fixing it ourselves, or at least a majority of it. Could it be something as simple as a seal? Any thoughts or ideas?