Rear end ratio on 67' L79

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  • Mike Arteaga
    #1

    Rear end ratio on 67' L79

    Someone made reference that we can tell what rear we have by counting revolutions when hand turning the rear wheels on a lift. Any one gotany info on this or is there another way without disassembly?? Thanks in advance.. Mike #34566
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    • Gary S.
      Extremely Frequent Poster
      • August 1, 1992
      • 1612
      #2
      Re: Rear end ratio on 67' L79

      Jack the rear of your car up. Put a tape mark on he driveshaft and an opposing tape mark on your differential. Put another piece of tape at the 12 o'clock position on your fender well and a pencil mark on your tire. Rotate the tire one complete revolution and count the number of times the tape mark on the driveshaft passes the one on the differential. 3 1/3 equals 3.36. 3 1/2 equals 3.55, etc. Very quick, easy and accurate.
      Gary
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        • Duke W.
          Beyond Control Poster
          • January 1, 1993
          • 15229
          #3
          Re: Rear end ratio on 67' L79

          Here's an easier way.

          Axle ratio = revs@60/775

          The above assumes that the installed speedo gears are correct, but is independent of installed tire revs/mile; 775 is the revs/mi for the OE tires.

          Duke
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            • Mike Arteaga
              #4
              Re: Rear end ratio on 67' L79

              Thanks Gary Thats what I was looking for! Pretty easy since I store my car on a frame lift!! Thanks again Mike
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