Rear tire went flat the other day so I put the jack underneath and Proceeded to pull the rear tire and wheel from the bike which I have done many times before as I have owned 5 different Ventures from 1963 to the current 1999. Took the 4 nuts that hold the rear drive shaft and removed it. Replaced the rear tire and reinstalled the drive shaft the same way I have always done it. Put everything back together and now the trans is locked in neutral can not shift to any other gear. Does anybody any idea what I might have done wrong and how to fix it. Any ideas would be great Thanks