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Thread: 2002 Duramax LB7 quick info

  1. #1
    Advanced Tuner
    Join Date
    Sep 2006
    Location
    Lake of Como - Italy
    Posts
    219

    2002 Duramax LB7 quick info

    hello guys,
    I'm not skilled on diesel, more on petrol...
    I see the tire size wizard is not there... how about properly adjust speedometer and tire size / transmission shift point?
    all manually?

    thank you

  2. #2
    Potential Tuner
    Join Date
    Feb 2019
    Posts
    5
    Speedo>Calibration>VSS Pulses Per>#new number#

    SO 28 inch tire to 31 inch tire #Old Tire Size# / #New Tire Size# x #Old VSS Pulses Per# = #New Pulses Per#

  3. #3
    Potential Tuner
    Join Date
    Feb 2019
    Posts
    5
    Trans>Shift Schedule

    All there on that tab.

    try normal first.

  4. #4
    Potential Tuner
    Join Date
    Apr 2019
    Posts
    6
    I know this is semi old. I finally bought a tuner and went to adjust my tire size. I'm confused on why the ecm has 3.72 and tcm has 4.10 as final drive ratios? Shouldnt they match?