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  1. 2011-2014 V6 Mustang
    I recently upgraded my rear axle gears in my 2013 V6 from 2.73 to 3.73. I have tried correcting the speedo error using my SCT X4 tuner, along with the canned tunes that come with the tuner (I have not purchased any custom tunes yet). Even when I set my axle ratio to 3.73, the speedo error...
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