That's a Borg Warner differential. It's the same design that is still being used in the Holden cars, 3rd gen Camaros and Firebirds with the Borg Warner 9 bolt rear end, the '04 to '6 GTO and others. Yours is the 4 pinion design, which is pretty strong. It can be reconditioned at least once. I've done a few. It requires some machine work on a lathe and some hardened shims.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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