Speedometer is Off

Discussion in 'Forum Requests' started by Bob D., Mar 20, 2019.

  1. Bob D.

    Bob D. New Member

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    Hi Everyone,
    I’m new here as I just bought an 05 QC. I’m finding that the speedo is reading 6-7 mph faster (at highway speed) than I’m really going. My 1st thought was that the tire size must be off, but they are 305/40R22 which I believe are the correct stock size. So then I’m thinking I had to be gearing. Is there an easy way to tell if the gearing has been changed and what it might be? Is the best way to jack up the rear end and getting the ratio by comparing the wheel rotation to the driveshaft rotations? Could the tranny gears be different? Any thoughts?
    Thanks,Bob
     
  2. Bob D.

    Bob D. New Member

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    Location:
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    Sorry, I think I posted this in the wrong place.