Driving our 95 Mitsubishi Galant in the rain at 65 mph, I hit a section of road that had water on it. After hitting the water the transmission quit working and I had to pull off the side of the road. The gear shift works find but the car will not move. We had it towed home and when the car was being pulled on the trailer I watched the wheels and they turned fine. There was not fluid on the ground and the fluid level was fine in the car. Any ideas of what the problem may be and how much it might cost to repair? Thanks.