So last night I was driving my Cub Cadet 3235 in the dark. I was going at a pretty good clip when SLAM I ran head on into the cast iron septic vent pipe which stopped the tractor dead in its tracks and dented the deck pretty bad too. I was able to back the tractor out from the pipe, but then when I tried to go forward again, the tractor just jerked a bit and made some clunking noises, but otherwise wouldn't move- not in fwd or reverse. Engine runs fine, PTO engages just fine, but the tractor won't move in either direction. What did I do???? Any ideas how to diagnose and fix this, or should I just take it to a professional repair shop?