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Thread: 6L80 3->4 shift issue

  1. 06-19-2012 #1
    G8V8
    G8V8 is offline
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    6L80 3->4 shift issue

    I did a WOT run up thru the 3->4 shift and then lifted. I expected to feel the trans shift up to 6th as I coasted down to legal speeds but I did not feel the shift and the RPMs remained the same. In the screen capturs you can see the 3->4 shift, me lifting, the trans upshifting to 5th briefly then dropping back to 4th. In the second screen capture you can see it stayed in 4th then eventually upshifted.

    We have been working on a tune after some upgrades. Any ideas what might have caused this?
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  2. 06-19-2012 #2
    G8V8
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    Here are the shift tables.
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  3. 06-19-2012 #3
    G8V8
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    Turns out it is PAL.
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