Adjust the sector preload (the nut/slotted screw adjustment) to get a 10 inch lb. rise in turning torque at the steering wheel nut with the Pitman arm disconnected. Start about 1/2 turn away from center, turn the steering wheel with a torque wrench and adjust the preload until you see a rise in turning effort as you turn across center. The turning effort should drop to the previous amount after the center point is passed. If there's a noticeable drop in turning effort in the exact center, the worm gear is worn out.
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!