Thanks for the replies. The ball from the driveline doesn't move around. It seems to bind on the top surface and looser on the lower service since it enters this union at an angle, i.e. the driveline angles up to meet the U-joint. The transmission shop that restored my rear diff/driveline found a new ball joint collar and it came with a rubber seal so I simply left this in place instead of using the cork gasket. I wonder if this makes a difference. I am hesitant to take the U-joint apart again.
I appreciate the expertise.
