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Speedometer adjustment

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by beb1979, Feb 20, 2018.

  1. Feb 20, 2018 #1
    beb1979

    beb1979 Bobtail Member

    5
    0
    Feb 20, 2018
    0
    I have a W900 Kenworth 2004 3.70 axle ratio on 24.5 tires ! My speedometer is reading way too fast they set the right code in ECM but speedometer still reading incorrect right now the Speedo switches say off,off,off,on,on,off,off,off,on,on, ? It can't be corrected I'm read about 15 miles an hour to fast
     
    beb1979, Feb 20, 2018
    beb1979, Feb 20, 2018
    #1
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  3. Feb 20, 2018 #2
    dibstr

    dibstr Road Train Member

    1,308
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    Sep 10, 2010
    Mississippi
    0
    Use the tire height from the ground to the top of tire (example 43 inches) not the tire size as stated on the tire.
     
    dibstr, Feb 20, 2018
    dibstr, Feb 20, 2018
    #2
    beb1979 Thanks this.
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