The easiest and less destructive way to remove them is to get a ball joint remover tool, it is similiar to a screw type puller. I think you may be able to rent them, or I have used the old 2lb ballpien hammer trick. Insert the pickle fork between the spindle and ball joint, put a short piece of pipe over the forks handle. Have someone put downward pressure on the fork by preferably standing on it, then take the big nasty hammer and hit on the spindle itself where the joint is inserted. Leave the nut a few threads on the ball joint so that it does not come flying out all at once and sending your helper and tools in several directions. This is a tapered fit and with a few good licks with the hammer(similiar to an impact wrench) it should come loose. But remember SAFETY FIRST-jack stands, spring support,safety glasses etc. Install it by making sure the taper is inserted down into the spindle far enough so it won't turn when tightening the nut. Good luck and BE CAREFUL!