Tahoe has loud "clunk" when wheel is turned sharply

Tahoe has loud “clunk” noise when i turn the wheel into a ‘tight’ turn - ie when i turn into a parking space. it does it for either side. had into dealer… could not find anything wrong - however the technician was able to replicate the ‘clunk’ - but could not find the cause

tahoe has 82k miles, is 2007 lt 2wd

have you heard of this before?