Ok vibration problem. Car on jacks, no tires, drums or driveshaft. How much vibration should there be with tranny in drive? I can "feel" it more in drive vs park.

THE YOKE THAT SLIPS INTO TAIL OF TRANNY HAS BAD WEAR SPOT ON ONE SIDE.

This is the second yoke that is going bad. The first one ruined the bushing and rear seal and blew fluid all under car. Has anyone ever seen this?

if it took 2 yolks out and rear bushing worn again. than either your driveshaft is out of balance or a u-joint no good but by any means pull tail housing and see if alot of up and down movement on output shaft and if alot of play tranny needs new bushings also. you may also have a bad ground. look at tail bushing for gauling.