while driving at 60mph and coming to sudden stop my car sway left to right many times before coming to a complete stop. After having it check by a mechanic the upper ball joint (driver side)needed to tighten and the swaybar links front and back need to be change as well. Are these links difficult to change DIY.

 

The sway bar end links are pretty easy and there are instructions on this list that explain it in detail.
The sway bar bushings are pretty hard to do.
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The sway bar links for the standard S and the R are very different but both are easy to replace...a garage or driveway project. Both links and bushngs were available on Ebay and Amazon. The mounting bushings are all but buried and I needed two wobble joints and both of my longest extensions to get a socket on the bushing clamps. A pro could make it seem easy but it was my first rodeo... it can be done..have fun..
Phil

 

Here are the rears thanks to Rick:
https://www.jaguarforums.com/forum/s...ics-faq-55280/

 

Thanks guys I will try to replace them myself