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I could be wrong here, but I think most G-body ('78 to '88 Cutlass, Monte, Grand Prix, Regal, Malibu, etc.) rears have 7.5" rear ends, not 8.5". The 7.5" is the weakest rear end GM ever made. The only G bodies that had the 8.5" rear were the 442s and Grand Nationals/Turbo Regals.
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