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Thread: 2018 Sierra 6.2 gear change

  1. #1
    Advanced Tuner
    Join Date
    Jun 2012
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    2018 Sierra 6.2 gear change

    I am going to change my gears from 3:23 to 3:73. This might be a dumb question but the only thing I see I need to change is the gear ratio in speedo programming. Is there more than that or am I all good. Thanks

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
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    Rogers, MN
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    Under the edit tab, use the gear tire ratio calculator.

    Plug in your new gear ratio and current tire size (it'll be the same), then make sure the auto scale transmission settings box is checked. That way it will move your shift points around for you to make the change smooth.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Advanced Tuner
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    Jun 2012
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    Thanks I was hoping it was that easy. Where is the auto scale transmission settings box?

  4. #4
    Senior Tuner
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    Mar 2011
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    The Autoscale is in the same Tire/Gear Ratio Wizard. You will see it when you open up the Wizard.

  5. #5
    Advanced Tuner
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    Jun 2012
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    Thanks