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You shouldn’t have a problem funding a replacement for the rear u-joint but presuming the V8 cars used the same type as the 1951-1954 models, the front uses a ball and trunion which is no longer available although there are kits to retrofit to a standard cross-type. I was lucky to find an NOS rebuild kit for my 1954 Patrician.

What is the listed size of the rear? I can only assume the front U-joint is the same as the rear. I do not have the trunion type joint at the front of the shaft since I am running the 3 speed manual over drive and not the twin ultramatic.

I think I have a new rear U joint lying around. Not sure what it is for, though. It's probably a Senior Ultramatic type.