Steve,

This may be too basic, so excuse me if it is. The upper ball joint stud is tapered and must be removed from the bottom (nut side). You might try using a little heat on the spindle and then hitting the side of the spindle (where the stud is located) and then hitting the stud from the bottom. That should get it out. If that doesn't work, then I recommend you remove the whole unit from the car and take it to a machine shop so they can remove it for you.

There should be a small bolt in the top of the ball joint. Remove the bolt and install the grease fitting.

Hope this helps.

Tom