I've had some SEVERELY stuck steering dampers to deal with over the years- one that had all the hardware loosened by an owner and had been driven that way in hopes that it would loosen up. For years. No, it didn't.
Get a pickelfork. Hammer it in, if possible. Failing that, use something along the lines of a 2-jaw press, whatever it takes to put dynamic tension on the fastener in question, in the direction you want it to go.
Hose it down with PB Blaster, AT fluid/Acetone mix, or Kroil penetrant (in ascending order of how well they've worked for me).
Apply a couple heavy wacks to the stuck item, in the direction you want it to go. NOTE: if it's a threaded part, thread a nut onto it to protect the threads- you may not want to reuse the part, but if you munge the threads you're making it hard on yourself).
Add some more tension, if possible. Add more chemical. Beat on it some more.
Now, beat the hell out of whatever the fastener is going through. IE: if a drag link, beat the heck out of the draglink itself, at right angles to where you want the item to go. The idea is to set up (very small) pressure waves and ripples in the seized material.
Yes, I know how ridiculous that sounds. "Ripples in solid steel, from a hammer". I agree... now go try it anyway.
In so doing, I've have pitman arms that VERY large guys who couldn't get the item off with the breaker (and had broken several already) pretty much fall off after a couple love taps. They don't necessarily have to be heavy taps either- start moderate, then build from there.
One guy brought a pitman arm on his steering box into the local Oreilly while I was there. He was so fed up with trying to get it loose all day he was just going to buy a new pitman as well. He'd been trying to free it with it bolted to his Dodge. I broke it loose on the floor of the store, with a pipe wrench stepped on by my size 9.5 foot (and while I AM heavy, I'm NOT *that* heavy!). Got a nice bottle of Jameson out of that one.
After every couple half dozen or so taps, see if you can add tension to the tool/press you're trying to push the stud out with. Bet you can!
This has never failed me.