Same thing happened to mine after a day of wheeling. They ended up replacing the whole transmission!
Good luck...Maybe you'll make it there by Friday or saturday. It really doesn't take them long to change one out, and you get a your tranny, and coolant fluid changed out for free!

Hey...If you're in San Antonio, lets go out for a few drinks, either Thursday/Friday!
It's St.Pattys Day. I'll get the 1st round of green beer!!
Give me a call 210-381-9020
Either way,
Good luck...Hope to meet you on saturday!
Ric-H2