Originally Posted by Mean Max
The bushing in the tailshaft housing is a bronze/brass/copper type bushing. The yoke may be worn, but most likely the softer metal bushing has taken the most beating.
I had assumed the same thing at first when I developed a leak. Replaced both the seal and bushing to no avail - still leaked. Had to put in a new slip yoke to finally stop the leak. I recall a post or sticky here on JF that recommended replacing the slip yoke when you replace the bushing/seal because of the possibility of the slip yoke being worn. I decided to skip that recommendation and found out that my slip yoke was the problem.
Of course, no reason to replace the slip yoke if the problem lies in the bushing. One step at a time.