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Sorry not right by the ball joints or your right it will load them up. In between where the control arms mount to the frame and the ball joint mounting points is best. By lifting by the frame there are too many other factors involved to correctly diag the ball joints. One being the control arms them selves. By putting the jack under the ( one side at a time) control arm, then lifting the wheel just far enough off the ground to get a big bar under the wheel then lifting upward under the wheel this will show you if there is any play.
Another test is to have someone simply turn the steering wheel back and forth (car not running) and watch for play in your idler arm (opposite of steering box)/pitman (on the end of your steering box)arm inner and outer tie rods. and center link. (these all connect to your steering knuckles and link it all together. )
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