Differential Gear Ratios for my '66 - NCRS Discussion Boards

Differential Gear Ratios for my '66

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  • Mark J.
    Very Frequent User
    • March 1, 1996
    • 254

    Differential Gear Ratios for my '66

    I have two differentials to choose from and I want to confirm what I have.
    The first is stamped 11-37, GM #3735390. I believe this is a 3.36.
    My question is in regard to the second gear, which is stamped 12-37, GM #3756448. If this is a 3.08 I'll be a happy guy.

    My gratitude in advance,

    Mark R. Johnson
  • Mark J.
    Very Frequent User
    • March 1, 1996
    • 254

    #2
    There I go answering my own questions...

    Colvin's, p.303, confirms what I have. Never mind...

    Comment

    • Duke W.
      Beyond Control Poster
      • January 1, 1993
      • 15610

      #3
      Re: There I go answering my own questions...

      Just to be sure you should count the turns ratio. It's always possible that the OE gearset was replaced with a different ratio.

      Duke

      Comment

      • frank mccracken

        #4
        If you go to all the work of replacing the....

        diff and the ratio isn't what the case #'s indicate, say 4.11's or something instead, that would be bad............ it's sure worth lookin' inside.

        Comment

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