Steering not smooth in a lefthand turn

[mjdunn]

I have a 1939 Ford DeLuxe Tudor. When I turn the steering wheel left it hesitates when I get to the 3/4's of a turn of the steering wheel. It then takes a little extra effort to go past that point. When I turn right it doesn't happen. I jacked up the car to turn the wheels manually and found that the arm that comes out of the steering box seems to hesitate. I do not see any play in the front end. What do I need to look for to solve the problem?

 

[JSeery]

Are you sure the steering box is adjusted with the wheel in the center position (between full right and full left)? I could see this happening if the adjustor was tighted down off center.

 

[rotorwrench]

There could be some surface irregularities in the worm gear in that location. They usually wear out in the centered location but corrosion and other factors can change that.