Couple things to check. The actual sway bar bushings, not the links. There was a poor design that had the opening in the rubber towards the inside that would cause the sway bar to hit the body under breaking/accelerating, bumps. Another thing to look at is the upper diff pinion isolator bushing on the top of the front diff. Mine is torn, you can watch the diff move a good 3" up or down when put in gear, I can only imagine that when put under load it causes the isolator bolt and inner bushing to make contact. There is a bunch of threads on thus issue. Even my gf's '07 XK that she babies has a torn diff bushing.