You might consider taking a look at the guide rod mount, which is the thing that the round tube (guide rod) screws into at the rear of the front lower suspension.

In my SD, it was rusting in the pivot bushing/bearing whatever it is inside the rubber, and made a lot of noise when hitting bumps, as well as if I turned and then reversed directions while still having the wheels turned.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...