Problem removing a pitman arm

I am trying to remove a pitman arm from a steering box I have. I so far I have bent two pitman arm pullers trying to get the damn thing off. I have heated it with mapp gas, and then sprayed it with CRC freeze penetrating oil multiple times, then used my impact gun on the pullers. Sonofabitch wont come loose. As a last resort I am going to remove the box from the car, pitman arm and all, and cut the effing thing off. Anybody got any other ideas besides using dynamite on this one?