Had to leave a reply to revive this thread but I've searched all over the Internet to try and find out why there's a loud bang while reverse and Turning and clunky over bumps. The condition as many described here and it had me going crazy. I just picked up from my dealer and turns out it was a loose bolt on my front right caliper. With the loudness of the sounds I heard I thought for sure it was something serious but so relieved when they told me it was just a screw. Now rides perfectly. Hope this may help anyone else looking for a possible solution. Cheers. Car is a Yukon Denali.