Used to notice the same thing when backing while turning sharply out of my space at work. Could not id a mechanical problem. Finally I attributed it to a slight difference in track angle of the front wheels at extremes of steering, causing tension that would release itself with the clunk when finally one tire had to abruptly skid a little bit sideways to relieve the tension. IDK if this is diagnostically accurate, but the clunk went away whenI just stopped cutting the wheel so sharply while backing.
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