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rear differential

  1. Mlehnert623

    Rearend ratio upgrade???

    Hi all!I have a 2008 Roush 427R, supercharged 4.6, with 3.55's in the rear. Unfortunately, I have recently discovered that both my rear axles are bent and need to be replaced. Since the dealership will have the rear diff open, do you think its work upgrading from a 3.55s to a 3.73s?My...