Thanks. The only reasone I'm considering the swap is I had a vibration with the clutch pushed in and reving the motor. I pulled the trans out of my formula and tore it down and I could tell it was a fresh rebuild,so I didn't replace all bearings. The bearing on end of the counter shaft(5&6 gear)were it sits in the tailhousing was bad. I replaced it and the race,put it back end and two days later same thing. I have no idea what would be causing the problem.