Hopefully, Steve is right. Most likely as he describes (driveshaft, coupling, etc.) I remember a Chrysler Torqueflight we had set up for racing, the planetary drum split and the planetary gear carrier self destructed leaving us with the tranny still turning, unable to use park and a lot of nasty noise. Why this was my immediate thought escapes me. I guess it's my pessemistic attitude about sudden tranny failures. Good luck and follow Steve's advice. I always hope that's it's not as bad as it sounds (no pun intended)...
2000 Dodge Grand Caravan SE