I have read about this method to change the pitman arm seal. Thought I'd give it a try.
1. Remove the nut
2. Pull the arm off
3. Remove the dust seal
4. Remove the lock ring
5. Remove the washer
6. Then for the cool part... Put a pan under the steering box, start the engine and turn the steering wheel as far as it goes to raise the pressure. I heard something pop. Turned the engine off and checked the seal. Sure enough, the seal had popped out!
Thank you, whoever it was that posted this earlier! You saved me a lot of time!