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Thread: Speedo off

  1. January 31st, 2014 #1
    byrdman11
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    Default Speedo off

    First I'm new at this tuning stuff. I have a 2011 silverado with e38 ECM and I install a 4l80 with a gm tmc
    I put shorter tires and speedo is fast by 5 mph at 60 . I put tire size in both TCM and ECM and tire pulse per mile but no change in speedo. please help what can I change to fix this.
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  2. February 2nd, 2014 #2
    byrdman11
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    Default

    No one know what to adjust to correct speedo.
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  3. March 2nd, 2014 #3
    Bearce Sr
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    Default

    change # in ho136
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