Rear End Ratio??? And Speedo Gear?

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  • Mike

    #1

    Rear End Ratio??? And Speedo Gear?

    I have a 74 L48 4 Speed. When I bought it, my brother had taken out the speedo gear for some stupid reason and he lost it. Now I'm trying to replace it and I have no idea which one I need. I tried to figure out the rear ratio by spinnignt the driveshaft and counting revolutions and I got 11:4 which works out to 2.75:1. I have NEVER heard of a vette w/ this ratio and am wondering could it be a 3.08? Help?

    Mike.
  • Bill Baird

    #2
    Re: Rear End Ratio??? And Speedo Gear?

    I believe that there was an "economy" rear-end ratio of 2.73:1 available in the mid-70's. I'll have to check for more details when I get home this evening.

    Bill Baird

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    • Bill Baird

      #3
      Re: Rear End Ratio??? And Speedo Gear?

      I believe that there was an "economy" rear-end ratio of 2.73:1 available in the mid-70's. I'll have to check for more details when I get home this evening.

      Bill Baird

      Comment

      • Bill Clupper

        #4
        Re: Rear End Ratio??? And Speedo Gear?

        3.36 is the highest (lowest numerical) listing for 74 from Factory. codes AX or LR. Driven gear would be a 3987918-18 tooth gear with an 6478879 adapter. The '918 is a Brown color.

        Comment

        • Bill Clupper

          #5
          Re: Rear End Ratio??? And Speedo Gear?

          3.36 is the highest (lowest numerical) listing for 74 from Factory. codes AX or LR. Driven gear would be a 3987918-18 tooth gear with an 6478879 adapter. The '918 is a Brown color.

          Comment

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