OK. With the different bodies, it helps for us to be sure which one you have, sometimes posts get skipped over if there is a question on which body style it is.
Door adjustment on a '55 2nd......Oh boy. There are factory adjustments, the hinges are slotted on the straps that bolt to the door, plus there's slots for verticle adjustment in the cab mount part. The hinge pillar in the cab is also set up for in and out adjustment, using cage nuts. It helps if you have a partner to adjust the doors, as they are very awkward (not to mention heavy) to wrestle around alone. You'll need to be very patient working on them, as they can be very dificult to get right. I still have never got mine exactly right. I partly balme that on poor quality door rubber, and also my own impatience. if you replace the rubber, go with Steele Rubber. They seem to be the best on the market.
One thing I do suggest you do before you get too carried away is get a shop manual. All of the suppliers carry reprints, and it can also be accessed
here for free.
If you have any questions, don't hesitate to ask. There quite a few of us Task Force guys on here.
