I would have the front suspention, evaluated. It may be a worn ball joint, or tie-rod. To correctly inspect the tie-rod, the tire should be off the ground, and checked for side-to-side movement as well as lateral. The lower arm connection points to the subframe can also cause this type of noise. Although you've already inspected it, it is more common for it to be front brake components, such as the brake pad hardware on the slides.
-Rip
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