Driveline vibration help

m99roadster said

The car was put on 4 jack stands to try to locate the vibration, it looked to me that the slip yoke was bouncing up and down when it hits 60mph.

Or do slip yokes wear out where they ride on the tail shaft.

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slip yokes can be worn, but usually that is in high HP applications. the splines can get twisty, then they dont slide in and out like they are supposed to

i'm thinkin if the slip yoke is bouncing it's the universal or somethin in the tail of that trans.

you could replace the slip yoke, and U joint then test it again. at that point if it's still there you KNOW it's the trans