Stubborn Pitman arm

What caferacerx said is the way I do it too. What I also do is index the old arm with the pitman shaft with a small punch and then mark the new arm in the same spot so the new arm goes on the same way the old one was. Also thread the nut on the end of the shaft so that when it finally pops off it won't damage anything. Also a good puller will last for years. Mine is 35 years old and removed many pitman arms.