The steering column comes off with the steering box. You'll need to remove the drop from under the dash, the drag link, pitman arm, and steering wheel. Then unbolt the box from the frame. The column will have to be slid out through the hole in the floor. The cab can be removed easily after that. When you take the cab off, take note of the mounting rubber and any shims that might be present, that will allow you to reinstall it back in place properly.
