Read this, https://www.flickr.com/photos/advance-design_parts_co/sets/72157632210242370/

Yours very similar to the one in the manual. All the same adjustment will be made in the same order. The tube comes off, but the shaft is part off the steering box. Both need to come out the bottom of the cab. On my '37, I can wiggle the tube around enough to come out the top, but it's pretty tight and no real need to do it that way. Its much easier to lift the truck up on stands and drop the gear box out the bottom.