This 2005 Ford Explorer Sport Trac had worn ball joints, the lower is pressed into the lower control arm and the upper comes as a whole control arm.
This video will show how to replace Lower Ball Joint , Upper Control Arm with Camber kit install, and Sway Bar End Link .

Also the same procedure for lots years of ford explorer , explorer sport trac , ranger , mazda , mercury

Hope this video helps, Thank you for watching FixItPhillip! With FixItPhillip, you can fit it!