Thanks Dave. Yes I think it has the thin P as opposed to the thick P. The main caps are stamped with a punch and the case has the corresponding punch marks. That would make be believe that the maybe the posi came from that case; but who knows for sure. Are you saying that all the posi units came in cases with the thick P. I believe that the thick or thin P determined which plant produced the case. Was the final axel assembly also at the same corresponding Plants. And are you saying only one plant produced axels assembly with posi units?Welcome to the Team James!
I don't see a big "P" on the case of the differential. It is that case that is unique and only that case contains a limited slip rear end. If you have everything as you say go to a Corvette board and look for a rich doctor or lawyer who is restoring a 1953''62 Corvette. They are the ones who are paying through the nose for original limited slip rear ends because even back in the sixties very few cars ('vettes included) had a posi. They were only sold up north to traveling salesmen who drove Belairs and Biscaynes in the snow that ordered a limited slip rear end from the factory. Most of those cars rusted away from salted roads which makes a posi a rare find today.
Yes I know the P is not visiable, just didn’t feel like going out to the garage to take a photo. Here is one..so what’s it worth? The caps are marked with a punch for correct location? I think this is the thin P.There were 2 different "P"s, but they would be located on the side that we can't see in the picture.