This is an old thread, but just wanted to make a suggestion for reference...
When I replaced my pitman arm seal, instead of using a seal extractor (not everyone has one), I took the advice of another thread and used the power-steering pump itself to remove the seal.
1.) remove pitman arm (it can come off with a vengeance, so please be careful when using pullers!)
2.) remove snap ring
3.) with some fluid in PS pump (be prepared to lose it all over the floor), start engine and turn steering wheel back and forth to left- right-lock
It came off in 1-1/2 turns of the wheel for me, but it worked well.
My father-in-law is a mechanic and said I'd be better off replacing the whole gearbox to avoid all the work, but this method made it really easy. I hope someone else can use this!