Make a screw jack out of a 5/8 fine thread bolt and nut and a short chunk of pipe that the bolt threads just fit into.
Remove the balljoint nut (or loosen it a bunch). With one wrench holding the bolt head immobile, use the other wrench to tighten the 5/8" nut down on the pipe chunk, causing the balljoint(s) to move away from each other.
This way allows you to reuse a good balljoint and seal, too, instead of ripping the boot with a pickle fork.
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