When you reassemble the steering box, and you're sure everything is installed and adjusted correctly, the nut holdng the Pitman arm on needs to be VERY tight- - - - -like 200 ft/lbs or so. There should be no possibility of any movement between the sector shaft and the Pitman arm. It's usually necessary to use a dedicated puller and a lot of force to remove the Pitman arm from a steering gear.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!