if those are new it could be the ball joints. to test them take the wheel off get a large screw driver or pry bar and wedge it by the ball joint and try to make it move.

if they are bad enough when jacked up wheel lugs tight, if you pull and push the bottom of the tire it will move in and out.

best to get new lower control arms, they come with a new ball joint and new bushings. dormans are about 40 a side.