Yah I don't either but I called the guy who balanced it and he said it was the yoke. When I put it up in the air and put the it in gear I could see the wobble. I pulled the driveshaft and looked in the yoke and can see wear marks form the old u'joint caps and the stops at either end of the yoke are worn as well allowing it to move left to right in the seat. I tried to center it and the wobble is less violent but its still worse than when I started