[larrys40]

It would think it is NOT the steering box adjustment. If you have your steering stop tall acorn nut style on the backside of the spindle lock pins that is the stop for the spindle and steering limit. Make sure the lock washers are present as well. Other things that can and are most likely the issue are
the fatter profile tires
Brake rod return spring alignment at the bracket ( may be bowed outward)
Potentially very worn and or bent steering arms at the spindles

The steering box itself is capable of the lock to lock and should be approximately centered in a 2 tooth at 1.5 turns at the wheel.
The steering box can’t cause it to go anymore if the tall steering stop nuts are present. Make sure they have lock washers on them .

If you have a steering box centering issues that is a separate issue at this point…. In my opinion. Remove the steering arm (pitman arm) at the sector shaft and do step through all steering box adjustments in order to get your proper adjustment in the box. Worn components in the box will not give you a zero lash at center steer now matter what.

Larry Shepard