tips or tricks to remove upper ball joints

x-posted:, - followup set:
1990 isuzu trooper (198k miles), v6, 4wd, 4door, 4-wheel disc brakes.
attempted to replace the right side upper ball joint. (will be replacing both uppers and will be doing all tie rod ends).
[front] frame on jackstands. floor jack up under lower a-frame and jacked up fully to unspring.
removed cotter pin and loosened ball joint castellation nut a couple of turns. inserted ball joint separation tool (fork style) and hammered all the way in.
balljoint stud didnt budge from the steering knuckle :( i pryed up and down on the fork with no success. i litely tapped (horizontally) on the knuckle in hopes of "vibrating" the balljoint stud loose. no luck.
searched google for "tips tricks remove ball joint" and didnt turn up anything more than i tried. i've done this job on other vehicles in the past with immediate success.
... any tips/tricks y'all might know about?
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