Various Topics on Jaguar

..bil..

I have a '93 xj6 that has been making a rattle / clunking noise for a while.
After parking it the last time I noticed the rear right tire slightly tilted
top out. This morning I elevated the rear of the car and found the drive
axle slides in and out of the rear drive box almost a inch while pushing on
the top of the tire. The other side, when elevated, does not do the same, it
remains solid.

Question is, what needs replaced to repair the problem?
T.I.A.
Mr.Bill