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Thread: 2006 Silverado 4L80 shifting very hard.

  1. #1
    Potential Tuner fast450ridr's Avatar
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    May 2014
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    2006 Silverado 4L80 shifting very hard.

    My truck has been shifting very hard since I have begun tuning it. I have lowered shift pressures a lot and it hasn't seemed to help any. It continues to spin the tires from 1-2 at <40% throttle. Going wot from 35 roll is nothing but ridiculous wheelspin as well. Would lowering the downshift pressure modifier help correct this? What have you guys done to fix shifting and drivability before? My current tune is attached to this post. Any help or suggestions will be appreciated. Thanks.
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