Hi Damon500
Thanks for advice. I looked at a pitman arm puller but the grips look to thick to fit under the arm. There's a bit of play on the spline but not enough to get the grips under.
Have taken the top of and replaced the gasket, that was easy, and the box is out. There are a few other seals and a gasket under the pitman arm that In wanted to replace, since there was a leak from one of these. I'll leave as much together as possible. I'll try the hammer.
Incidentally, I've managed to break 4 ball joint removers so far, until someone told me to try some heat. Heat didn't work on this one though (broke number 4).
Also can't get the castle-topped nut off, but I'm thinking I'll have to make something to slot in and twist.
Once the steering is done, the re-build starts, so this is holding me up.