Unsymmetrical steering issue

I'd pull the pitman arm, carefully center the box, pull the steering wheel/re-center, then put everything back together and see what happens.

???you can't do that unless the master splines have been ground out. The pitman is keyed, and the column/ wheel is keyed. Only thing you can get "off" is installing the coupler parts 1/2T off, or as mentioned^^ tie rod ends need to be "walked" over to center the wheel