Pesky vibration...

Tooljunkie said

There are wedges you can buy, they are cheap,will aid with diagnosis. Will need u-bolts to go with, unless you have had them apart recently.

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Next time I have time to do so I'm going to jack up the car and check the pinion angle against the transmission. That very well might be the case. Otherwise, it might be the pinion bearing after all because there is a little bit of play. It didn't feel like a whole lot by hand, but at 3000 RPM that might be plenty of room the wiggle