Steering column is part of the steering box, they do not come apart. Should be a couple bolts holding the gear box to the frame. Pull the pitman arm off using a heavy duty puller and big hammer before unbolting from frame. Once it is free, jack up the front of the truck fairly high, and the assembly will slide out.
If you are careful, you can pull the steering wheel and leave the column when lifting the cab. You just have to pull cab up and backwards at the same time to keep from hitting the column. The retainer that holds the gear to the frame is round, so loosen the bolts and the whole assembly will rotate, which will help in clearing the cab as it comes up.
Joe
