Driveline vibration out of now where! Help!

Can put something like a tin can over it if you can find one with a good fit to the tail housing secure it with a large hose clamp. When all else fails and you just want to make your test quick.

This is probably not a good idea because you need the yoke sleeve in there to support the end of the tail shaft at the rear bushing so it does not wobble around and cause more damage.