Chris,
Get the numbers off your rear. ID what you have for sure, then go from there. My money is on 8.2" for a Pontiac produced for US sale. Other countries, canada for example, got different drivetrain packages in the same car.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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