Well there is a thing that happens to auto trannys when they sit alot. I dont know the official term, but ive always called it, "converter drain back". The torque converter drains back into the tranny slowly, but never the less, overwhelming the seals, and hence the leaks. Dont know if this is whats happening or not, but should be confirmed. The tranny builder should have a idea if thats the case. A new torque converter is usually the fix. Why this happens, i dont know? Good luck and keep us posted.
