Started getting bad vibration. Found seal was bad at yoke to transmission. Also found a lot of play there. Trying to determine if the yoke is bad or the transmission. Any thoughts? Thanks in advance.

 

After replacing Slip Yoke and Universal Joints I've came to the conclusion that the issue on mine is the output shaft Bushing in the tailshaft Housing. If you if any vibration in the Driveshaft or you can physically push up and down or side to side on the Slip Yoke then to Bushing needs to be replaced. If you have the tool it can be done without taking the Housing off if not then drop the Driveshaft and remove the Housing and have it replaced. Not a overly hard job but definitely a pain it the butt if you're laying in your driveway.