I own 2004 xj8. Recently when i hit the bump car shakes and make griding noise not from engine feels like underneathe from somewhere.. But when i reduce the speed it disappear(when it hit 20mph range).
And it happens again when i hit the bump. Does any1 know what that is???

Also any1 know how much it will cost to convert to regualar shock instead of air suspension??

 

We had a similar issue when we purchased our 2008. Jaguar replaced the front sway bar bushings.

Hope this helps.

Ted