Volvo RWD 120-130 Forum

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Speedometer/Odometer error 120-130

posted by  fredvolvo67 on  Sun Apr 29 09:13 CST 2018
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last visit: Fri Oct 24 12:33 CST 2014
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I know that this subject has probably been covered numerous times, but I'm still puzzled.

I have a '67 122S 4dr. with 4.10 rear end ratio, running on 195/65R15 tires and have installed an M41 OD trans out of a '67 123GT. I had the blue gear p/n380168 in the trans, but speedo read about 20mph fast and the odo was off a good 10%. I have now installed a 19 tooth gear p/n380305 hoping that it would correct things, but to no avail.
The speedometer is still reads fast, but only by about 7MPH, but the odometer reads short by 14%, (for every 10miles traveled the odometer only records 8.5miles ). Is there and easy way to correct things so that the speedometer and odometer are more accurate ? Thks








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    Speedometer/Odometer error 120-130

    posted by  c1800 on  Sun Apr 29 11:35 CST 2018
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    last visit: Sun Oct 5 19:37 CST 2014
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    Some info in this thread, right here on brick board.

    https://www.brickboard.com/RWD/volvo/1370431/120-130/speedo_drive_gear_teeth.html








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      Speedometer/Odometer error 120-130

      posted by  planetman on  Sun Apr 29 15:28 CST 2018
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      last visit: Fri Oct 24 09:29 CST 2014
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      I forgot to mention in that post that the use of non-stock rolling diameter tire sizes will change the accuracy as well.

      The speedo repair shop I use can install an adjustable gearbox inline with the speedo cable to correct the speedometer, but the car has to be at his shop.

      And I am not sure the adjustable gearbox modification will also make the odometer more accurate.

      --
      Eric
      Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
      Torrance, CA 90502







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