I think this is pretty normal. The tension rod and wishbone do not move on a fixed axis. They are allowed to twist as the wheel is turned. It's kind of hard to explain, but the next time you have your front wheel off, grab the control arms and twist them. You will see that they can be rocked back and forth within the travel allowed by the spherical bearing/bushings. What I think you are hearing is the control rods moving to there maximum allowable travel, which is only audible when you hit a bump at full lock.
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