So my buddies 7.3 has problems with what I'm guessing is his steering box he has power turning right but no power when turning left, Im guessing the box is shot, but I want to make sure the hydroboost can't mess with the steering (I have the older vacuum pump and this is a new system for me) is it possible this is a symptom from the hydroboost system Or is the box just shot?

 

Sounds like the steering box to me. The hydroboost is only pressurized by the steering pump and would not affect it that manner.