I replaced the front lower control arms. Since they are now "spares" for warranty return, I tried to take one of the ball joints apart to see if they are pressed in. They are not. I pulled the boot off and it became obvious how the joints on these particular arms are constructed. (see photos) The side of the control arm where the ball joint arm extends is machined, the ball joint inserted into the opposite side and then it is capped and the cap is staked or crimped in place. No swapping these ball joints.
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