I have a clunk in the same general area when going over bumpy terrain, potholes, etc. Haven't had a chance to check all the nuts and bolts but when putting a level kit in the front I noticed that my steering rod from the rack unit to the driver side TRE has movement at the rack, not the TRE. Pulled the TRE and I can push/pull the rod in and out just a tiny bit, and it makes a small clunk that I think translates to a big clunk when driving. I did the same on the passanger side and it is tight, no movement. Don't know if this can be adjusted, but worth a shot.