If you need to replace the intermediate steering shaft, it's crucial that you understand how to properly detach it from the steering gearbox. The first thing that you have to do is to take apart the steering gearbox. It usually starts with removing the face cover from the input shaft, by detaching the bearing cap bolts that hold it together. While you're here, you might also want to consider replacing the input shaft seal and o-rings. Once the face cover is out, depending on what transmission you have, you might need to also remove the side covers of the gearbox. That should allow you to access and remove the steering shaft accordingly.