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Thread: 1-2 WOT slip after speedo recalibration

  1. 11-10-2010 #1
    hirdlej
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    1-2 WOT slip after speedo recalibration

    So I got some different tires for my wife's 2008 Chevy Impala and I'm having to reduce the speedometer by 10%. Easy enough, I change the tire size by 10% in HPT and have the auto scale transmission tables set to "yes". The speedo is right dead on where I want it BUT under WOT the car slips between 1st and 2nd gear. I put it back to stock for the time being and the slippage stops. No other changes were made. Here's the 2 files for your review. What do you think is causing this? Thanks in advance!
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  2. 11-19-2010 #2
    MMGT1
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    With your speedo scaled have a look at your trans input and trans output reported in third gear. Are you getting a 1:1 ratio?
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  3. 11-23-2010 #3
    hirdlej
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    I didn't change the output ratio so it should still be 1:1. Would that be a problem?
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