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Dave R;
My Versailles rear end has that same exact large hole in each flange from the factory for access to the backing plate nuts.......... I have worked on a few 9" p/u truck rear ends and they all had it too... Do not worry about a vibration or out of balance,they came from Ford like that since the begining of the 9" and have worked just fine...........
David
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DAVID GAGNARD
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