look and see if there is a big plastic box on the front of the trans with a good sized electrical plug going into the top of it. that is your valve body. i know on the caravans, neons etc (newer) its plastic, some of the older ones werent. anyway those valve bodies leak and cause problems and you can just replace the valve body. you might talk to the guy about it and get a second opinion. the thing is only held on by 3 bolts and it has a gasket on the bottom side of it. it might be easy enough to replace it with one from the junkyard and sell the car.