before u start udjusting the steering box,check your tie rods and drag link for play .Lift up car on the front.have someone move the front tires left to right in very short move ment.than u look underneath and see if the tie rods have any play.if they do replace them.possible u have high milage so i would relace them anyways.of course u need a aligment afterwards.als check the grag linc for play.most likely it is worn too.after checking and or replaced stuff the steering box can be adjusted.just dont udjust without checking for play