To clarify- I'm talking about the upper ball joint in the control arm.
I've gathered from the comments here that the whole control arm must be replaced, not just the ball joint.

My mechanic gave the wheel an up and down tug and showed me the movement of the ball joints- both sides. In addition, he told me that's why the inside of my tires had worn so badly.

Thanks for the info- I think I've got it from here.

Thanks again.

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Wordmanjay
Tribetown, Ohio