I've been chasing a high speed vibration--it starts about 60 mph and stays there up to 80 mph. If you throw it in neutral at that speed, the vibration stays. New tires, all balanced, rebuilt front end and aligned. Transmission mount was toast and has been replaced. Vibration remains. I pulled the drive shaft and inspected it. Shaft looks good. Both U-joints are good. The transmission tailshaft has play in it, probably more than it should have.I'm thinking new tailshaft bushing and a new seal might solve my problem. Anything else I should inspect while I'm there? I do not have a special bushing remover tool--if I remove the extension housing, will the tailshaft bushing come off without special tools?