I've got a 97' Ford Windstar with a slipping tranny. It bumps when shifting from 3rd to 4th(45-50mph). I consider myself lucky because it already has over 100k miles and still has the original tranny. Since it's paid for, I would like to keep it running for a few more months. At least till I get my H.T. “180 Day Same as Cash” account paid off.