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Thread: 4L80 wont shift at WOT.

  1. 03-11-2016 #1
    autoaddictions
    autoaddictions is offline
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    4L80 wont shift at WOT.

    I have a s10 with a 6.0 turbo 4l80 conversion. Im running a 3.08 rear 285/55/15 tire 27.9 tall. My car seems to shift ok at part throttle and the spedo is spot on. Can somebody look at my tune and log and see where I went wrong. The log is from a run at the track you can see it shoots straight past my MPH target and rpm. I had to lift then it shifted. atco.hptatco1.hpl
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  2. 03-28-2016 #2
    ZMBKLN
    ZMBKLN is offline
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    If you are certain your trans is mechanically sound...

    Check your VSS Counts to make sure they match your application.

    I've had several that have been tuned by others where they just "copy pasted" a tune from another vehicle, but didn't think to check the VSS counts first... This will cause exactly what you describe.
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