You can measure the rotational torque, or break-away torque, by measuring the diameter of the steering wheel, divide by 2. This gives you the distance from center to the grip of the wheel. Now, with the steering linkage disconnected, pack putty (Play-Do) onto the wheel at the 3 o'clock or 9 o'clock position until the wheel turns and the putty drops to the 6 o'clock position. Remove the putty and weigh the putty with a simple kitchen scale.

Multiple the weight of the putty by the number of inches to the center of the wheel.

For example: It took 7 oz. of putty to turn the steering wheel. The putty was 8 inches from the center of the steering wheel. Now multiple 7x8=56. Now divide by 16. (16 oz. in a lb.) 56/16+3.5. It took 3.5 inch lbs of torque to turn the steering wheel.

You can start with the desired weight of putty applied and simply loosen the pitman adjuster until the wheel turns.

Do you know the specification for rotational torque on the box?