I have a yardman ridding mower and when I shift Into forward sometimes it will start moving then slip in to neutral, but the shifter will still be in the forward slot, so i will have to rock it a little to get it to go into gear and it grinds a little like tryin to find a gear in a vehicle. I'm not sure what kind of transaxle this is or if it is even a transaxle problem. Has anyone has this problem or know what's wrong?