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Thread: 8 speed transmission swap

  1. #1
    Advanced Tuner
    Join Date
    Sep 2006
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    Lake of Como - Italy
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    8 speed transmission swap

    hello guys!
    anyone has never swapped a 8 speed transmission into a 6.200 V8 Hummer H2, MY 2008?
    it's the same powertrain of Silverado 4wd same MY...
    it's not matter of costs, customer is aware of it.
    let me know!
    thank you!!!

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
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    13,565
    8 speed or 6 speed?

    The 8 speed didn't come out until 2015 and you couldn't use that unless you had a standalone transmission controller. Not even sure if they make one of those yet.

    The 6 speed started in 2007, so that seems more do-able if you can get the correct file and programming right.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Advanced Tuner
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    Sep 2006
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    Lake of Como - Italy
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    yeah... I suppose also a different bellhouse... the MY08 already has the 6 speed.
    tnx