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Thread: 10 Suburban 6L80 to 4L80

  1. 1 Day Ago #1
    LSPlatty
    LSPlatty is offline
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    Jul 2025
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    10 Suburban 6L80 to 4L80

    I'm really gearing towards this swap. Been reading a few with details but I don't want to butt into another guys thread.

    Harness. Any guys here building them for the suburban to adapt to the suburban with the programmed TCM?

    What year 4L80 should I get?

    Any heads up? Thank you

    2010 Suburban 5.3 w/ 6L80
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  2. 1 Day Ago #2
    RDF1
    RDF1 is offline
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    Any Reason why going from the 6L to the 4L?

    the easiest is the 1998+ 4L80 trans.

    https://forum.hptuners.com/member.php?5378-Alvin
    https://www.pcmofnc.com/product/6l80...ion-harness-3/
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