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The upper arms are a little easier to deal with as the ball joint is either riveted in (stock) or bolted in (has been changed before) and the bushings are a little more accessible. To get out stock ball joints, just grind off the head of the rivets and watch the joint fall out. If they have been changed before then undo the hardware. The air hammer was used again to drive out the bushings, since there is a small amount of the metal shell sticking out the bit can grab right away making the job a snap.