Re: GM rear gears
Are you sure that the 4-series posi and related gear are in fact Chevy guts ? As JoeC suggests, BOP had ratios typically in between the Chev's. I don't *believe* that Buick had a 4.33, but Olds and Pontiac did. They may be Olds or Pontiac guts that you got in a box with the Chevy housing ?? Justa thought - especially if you never had the whole thing put together as an assembly.
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