2002 Trooper
 

My Trooper recently had it's transmission rebuilt for $2400. It drove fine for a month then it stopped. The tranny guy couldn't figure it out and Refund my money. It's works in reverse. It acts like it's in gear as when I put it in drive the rpms drop down. The mechanic said something about tightening of the bands???
ANYONE KNOW WHAT'S WRONG???
THANKS
TIM