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2007 GT500 40th Anniversary Conversion Speedometer Recalibration

Discussion in '2nd Generation Shelby Mustangs' started by eamatherne, Nov 19, 2009.

  1. Nov 19, 2009 #1
    eamatherne

    eamatherne New Member

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    Has anyone had to recalibrate their speedometer after the 40th anniversary package upgrade? Mine is running about 4-MPH faster than the actual MPH ont speedometer after the conversion to 275/35-20 rear tires.
     
    eamatherne, Nov 19, 2009
    eamatherne, Nov 19, 2009
    #1
  2. Nov 23, 2009 #2
    09vapor

    09vapor Member

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    I had to get mine recalibrated when I went to 20" tires.
    I had mine recalibrated by my The guy who Dyno'ed mine. They can change it with your programer if you have one??

    I had to order a device from Ford ($34.00) to "reset" my tire pressure sensors as well.
     
    09vapor, Nov 23, 2009
    09vapor, Nov 23, 2009
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  3. Nov 23, 2009 #3
    eamatherne

    eamatherne New Member

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    Thanks for the information. I don't have a tool to calibrate. I'll have to try to find someone to do it.
    I got so many mixed answers to this question. You would think that the Shelby guys would know at the drop of a hat whether or not this needs to be done?
     
    eamatherne, Nov 23, 2009
    eamatherne, Nov 23, 2009
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