Relocating your steering box is not a must unless you are moving your axle foward to the point that your tierod is foward of your draglink. Of course there are exceptions, If your axle compresses and the shackle moves your axle reaward to the point that the pitman arm cleares the tierod. Most often moving the steering box foward to the radiator support is enough to work. Tilting the box so as to move the pitman arm up towards the frame is also a good idea.