Removing Upper & Lower Ball Joint Studs From Spindle....

Here is one way...........big hammer, in the range of about 3lb mash hammer, also a large drift......back the retaining nut off about half way, turn the spindle full right or left, set the drift up against the spindle in the area of where the ball joint goes thru, give it pretty much a kill shot with the hammer, do this until the ball joint comes out of the spindle, move on to the next ball joint, repeat process

The idea is you are trying to upset the grip of the taper
Hope this makes sense to you