Need Help. Clunk in reverse ONLY (turning) R or L

[Tim W.]

I have an odd issue

2004 4.8 is 36k miles

In reverse turning left or right I get a clunk in the front end. Almost as if something is shifting. I have had sway bar links go bad on my other X and this is not the same, especially since it is only in reverse. Everything is tight under the car. The control arms seem tight etc.

I searched and found lots of info on the sway links. I know i have to replace the air bags up front due to a slow leak. Could it be the shocks internally?

Any ideas would help.