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Does anybody know the thread of the steering box filler plug on a 1951 coupe. I'm across in the UK and it doesn't seem to be a standard UK thread.
Eric.
I'd guess it's either US Standard or NPT as they did not use metric back then on anything. @CarlNutaitis or @GaryDubas maybe it's the same as your '48 or '49 and you can help confirm what it is?
I'm not the club's '51 expert though I can report on what my '46-'54 MoPar parts book show. The parts book suggests that the only '51 models to use a filler plug for the steering gear housing were DeSoto and Chrysler Windsor (6 cylinder). Further, there was a running change by s/n that suggests after certain s/n's there was no filler plug. There are no filler plugs listed for any MoPar models in '52 until they reappeared in '53. The MoPar p/n for the '51 filler plug is 1142221. Apparently, that part resurfaced and was used in the later fifites on cars with manual steering. If you search eBay for that p/n, you find several examples listed for the later model application: https://www.ebay.com/sch/i.html?_nkw=mopar+1142221&_sacat=0&_from=R40&_trksid=p4432023.m570.l1313
None are very expensive so maybe worth a try. Hope this helps.
