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Thread: 20074 Tahoe 4l80e swap question

  1. 04-10-2020 #1
    kendogg
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    20074 Tahoe 4l80e swap question

    I've been reading conflicting info, so hoping I can get a straight answer here. Doing an 80e swap ona n '07 Tahoe with a Magnussen supercharged 5.3. Can I use the stock TCM with a reflash for the correct trans file? Or do I need a TCM directly from an 80e truck/van?
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  2. 04-10-2020 #2
    speedfreak636
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    Seeking the same knowlege got all the install done today now wiring and programming.
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  3. 04-10-2020 #3
    mecanicman
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    The t42 can be programmed to run the 4l80.
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  4. 04-11-2020 #4
    kendogg
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    I see that now, there's a file for an '08 Express Van in the tune repository, and I found instructions for programming only the trans. Thanks!
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