1997 Mercury Marquis Lower Ball Joint

Suspension problem
1997 Mercury Marquis 145000 miles

I'm trying to replace the lower ball joint on this car (I just bought it from a friend of the family).

I took the tire off, removed the brake calipers, disconnected the sway bar, disconnected the steering control linkage, and disconnected the upper control arm.

I tried to get the steering knuckle off but the stud of the lower ball joint is completely STUCK in it!

I have tried a lot of things. I've tried hammering the stud, I've tried using a pickle fork, I've applied a penetrating oil which removed all of the rust... I've tried all three of these in combination and finally I've purchased a three pound hammer and whaled on the pickle fork with it. The end of the pickle fork is becoming more and more blunt and as I run out of breath I wonder why it is stuck and just how am I going to get it off.

I'm pretty sure a jackhammer could do the job... other than that I can hardly imagine.

I have to wear hearing protection while hammering it and I'm not able to work on it that often because of neighborhood noise restrictions.

I haven't used the full limit of my strength against it yet because I'm seriously afraid of damaging the car.