First thing I would do would be to remove the drag link from the pitman arm and see how the steering wheel feels when you turn it. Be careful not to turn it hard all the way left or right or you will damage the ball guides inside of the box.
If it is smooth turning, this would be a good time to go to the Truck Manual and follow the instructions for adjusting the steering box. (These adjustments need to be done with the drag link disconnected.)
Carl
