Had clunk start after I changed struts on a 2015 gmc 1500. I noticed that there was a little wear due to movement on the top of the strut mount where the 3 studs go through. I tightened the 3 nuts quite a bit more this time than the 37ftlbs. Unfortunately it was still clunking. I have the strut removed and there is some fresh metal filings present which confirms that the strut was shifting. Not sure why the strut is shifting.