You really do need to get a parts book and look at it. In the 28-48 Ford passenger and commercial(pickup) green book on page 88 you will see a very good exploded view of a steering gear that will answer your question. Remember that the mechanical parts of a pickup and passenger car are the same for your year.Guys, my, truck had a "hornectomy" before I bought it and replaced it with a button screwed to the steering column. Originally, did the '39 trucks have a horn rod with a headlight switch on the dash? Thanks.