A very old mechanic showed me this trick years ago. I never had to buy a pickle fork. Hold the first hammer firmly against the Tie rod, ball joint, pitman arm, then smash the other hammer into it. It changes it's shape and pops the joint apart. Leave the nut on a few threads so the part doesn't fall on you.
It works everytime. Don't use a sissy carpenter's hammer, usa a 2,3,4,or 5 lb baby sledge.
Rob