08-03-2022, 12:52 PM
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Ultimate Warrior
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Join Date: May 2002
Location: Rochester, MN
Posts: 2,536
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3.23 is the most common rear gear for '64-65 GTO's as I believe it was the default gear ratio for a manual transmission.
My 389/4bbl/4spd car also came with 3.23's from the factory.
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