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I have not seen one on the internet that is downloadable. The only place I have seen good ones is in the back of the FORD shop manual. My 56 has one, so if you find a 55 shop manual, you should be all set. I got my shop manual on e-bay, but you can order them from most places that carry old truck parts.
We sell new, licensed reproduction 1955 shop manuals for $29.95. We also have a CD-ROM version for $49.95. Click the Online Store button on the top right of the screen here.