The sector gear preload is what I'm talking about. It's the adjusting bolt on the engine side of the steering gear with a lock nut. Loosen the locknut, and tighten the slotted screw until there is a slight drag as the steering rolls over the center point. This needs to be done with the Pitman arm disconnected from the drag link. The turning torque on the steering shaft, measured with an inch/lb torque wrench at the steering shaft nut should increase 10 inch pounds as the center point is passed. For instance, if it takes 10 in/lbs to keep the steering shaft turning, as the center point is passed the torque should increase to 20 in/lbs, then drop back to 10. If there is an increase/decrease/increase in torque with a free spot in the middle, the steering worm gear is worn out and must be replaced. There is also a way to check center point preload with a spring scale and a string attached to the steering wheel. The inch/lb torque wrench is more accurate. Have fun!
Jerry
