I was replacing the stock pitman arm with a dropped pitman arm (4" lift). I cut the edge of the pitman arm almost to the shaft and it popped off the shaft easy after that. It hurt when the pitman arm and the puller fell on my ankle though. Damn it hurt.
And with good reason. It was the worst part about doing the SAS we did on my 1990. I actually ended up breaking my finger when it finally gave loose in one of the several rounds of installing and removing the pitman arm.
It sucks to get off, but there are a few tricks that do work. Soak it in PBlaster for a few days before you're going to remove it. Use a torch to heat it up. A BFH works well too...
puller+impact+sledgehammer and it popped right off.
i used the same technique except we had the puller on there putting pressure on it for about an hour and a half then my roomate hit it with a hammer one last time out of frustration and BANG...popped right off