How do you separate the upper/lower ball joints from the steering knuckle? I have of course removed both of the castellated nuts but both ball joints are jammed into their respective knuckle attachments pretty good. I tried by tapping the UCA upwards (hammer + piece of wood) but it wouldn't budge. It was suggested that I used a "pickle fork", which is basically a steel wedge. Do you suggest using penetrating oil; if so, would it harm the ball joint?

Your input and suggestions are appreciated.

Thanks,

Henrik