what you need to do is make sure the LCA is attached at the frame. Put a long pry bar between the ball joint and where it attaches. Push down with the pry bar using the frame area as an anchor point for the end of the pry bar (the opposite end you're holding). Before all of this, liberally soak the area with PB blaster or aerokroil penetrant. It will come out, often with a big "pop" . These are suspension components designed to take big loads at highway speeds. Don't be scared to use some ummph, just be careful.