I've had issues with the lower pinch bolt getting jammed. I usually go crazy with PB blaster and then use an air hammer with a fine point to drive the sucker out. The once it's out. I insert a wedge in the slit around the back of the knuckl and hammer it in the split open the pinch a little. While it's still in there I then use a crow bar tuck into the subframe (on pre-98's) or through the opening on the LCA to push down the remove the ball joint from the knuckle.
