Quote:
Originally Posted by russcc
Recently bought and installed a set of 51A-5713 rear shackle pins in the '40. These were Ford script, USA. They measured anywhere from .753 to .756 OD, and I believe the variance in OD was what appeared to be galvanize plating. It was so thick on the .756 ones that the nut would not thread on the shackle stud. I have not seen galvanizing on any of the shackle pins I have used before, so this was new to me. The lesson learned here was check the OD on each one, and if needed, take a little of the galvanize off, and by all means, before you install them, run a nut on the shackle threads. It was tough to run a die over the threads once they were in the spring perch.
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Russ, The diameters you'd found are within the Ford engineered specifications and as such there is no need to remove any so called "plating".
Ford used different metals for the casing on these pins. Terne plated steel, I believe, was the most common.