What is the best way to remove the pitman arm and what size is the nut?

 

33mm. 1-5/16" will be close enough to fit. Use a pitman arm puller, they're cheap. You can beat on it with a pickle fork, but I don't like what that does to the sector shaft bearings.

 

You need a pitman arm puller. Around $40. Tighten it down. Hit it with a hammer. Tighten again. And so on until it pop's off.

 

Yep.
Autozone has them for $15. Not shop quality but good enough for occasional use. Just wanted to point that out in case $40 for a better puller is an issue and the OP is tempted to use a pickle fork instead.

 

Ok 1-5/16" is what I measured also, so should I use an impact gun or by hand?

 

You can rent them from oreilly for free.

 

Ok got the socket and the nut came right off, but pitman arm will not come off! I have been putting PB Blaster on it for a week! Any ideas??

 

That's why those ^^^ guys were talking about a pitman arm puller, go rent one

 

Ya I got one, no go! I even ran it up tight with an impact gun and hit with a sledge hammer! It won't come off!

 

Time to cut the pitman then

 

You could try heating it up while the puller is putting pressure on it.

 

I don't know why I didn't think of that, I'm cutting it off Thanks!

 

I get the puller tight, then light the torch and heat up a spot on the arm keeping the flame away from the seal. Heat it until it's a dull glow in the spot and it usually pops free. It's a tapered fit like a ball joint, with splines in the pitman's case.

 

Don't go too deep

 

Yep! I cut almost all the way thru on opposite sides and them the puller tool it right off!
Thanks again for all the help!