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Thread: Transmission swap in E38/E67 vehicle.

  1. #1
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    Default Transmission swap in E38/E67 vehicle.

    Soon GM is coming out with a Gen IV 5.3L(LH8 ) equipped Canyon/Colorado. For some reason they are sticking a 4L60E in it. :( The truck will come with a E67 ECM.

    What I'm wondering is what would it take(ECM/TCM wise) to swap say a 6L90E into one of these things?

    I've heard that the ECM and TCM would need to be flashed with the OS from a vehicle with the same combo as what the swap is(E67/6L90E). Currently there is no vehicle that has a E67/6L90E combo. Can a E38 file be flashed into a E67 ECM? All the trucks that use the 6L90E have E38 ECMs.

    I'm just trying to get a better idea of what would be involved from a computer stand point in doing a swap like this. In the old days you just flashed in the appropriate OS and swapped a few pins around on the 4L60E to 4L80E swap.

    Thanks

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    GM is really doing that? I know the H3 Alpha is getting a 5.3L V8 and I assumed the 4L60E POS, but hadnt heard the Coly/Canyon is...
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
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    Yep, they are actually doing it. Really hard to believe after ALL the years of teasing people with V8 S10s/Colys/Canyons.

    The H3 Alpha is getting one too like you mentioned.

    Here is more info about it.

    http://www.performancetrucks.net/for...d.php?t=401237

    Anyone on the trans swap stuff?

  4. #4
    Lifetime Member GMPX's Avatar
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    4L60E will more than likely use a T42 TCM (External to the Trans).
    6L90E will of course use a T43 TCM (Internally fitted in Trans).
    It should not matter what the ECM is E38 or E67, it's all in the TCM and most things are just communicated on the GMLAN.
    But, it would sure be a lot of messing around for two extra gears!

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

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    I'm not as concerned about getting two extra gears as I am about getting a stronger transmission.

    And if people didn't do any "messing around" with their vehicles you guys wouldn't have much business.

    So what you're saying is that the ECM(E38/E67) doesn't care what transmission is hooked up? It sends out the same data for all TCMs? If that's the case and the ECM/TCM are that independent than it doesn't sound like there would be much hassle getting the electronic part of it taken care of, maybe an adapter for the connectors.

    Thanks Ross

    John

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    Joe (Moderator) joecar's Avatar
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    Rumour has it that the 6L80/6L90 may not be quite as strong as a 4L80E or a built 4L80E... can rumours be trusted...?

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    I don't really know, they are pretty new and I don't think many people have really pushed them yet. The only questionable thing I've read about a 6L80E was from someone with a new Denali(IIRC) that was running low 14s and saying the trans was acting up a bit. I don't know if that was tuning related or what though. If I can find the link I'll post it.

    In stock form the 6L90E is rated for more power than a 4L85E which is a beefed up 4L80E.

    Here are some of the power ratings(from gmpowertrain.com) in this link.

    http://www.performancetrucks.net/for...4&postcount=16

    I don't think I'd be pushing the 90E in the vehicle I'd like to put it in. An extended cab 4wd Canyon/Coly weighs less than 4000lbs which is an easy 1500+lbs lighter than the vehicles the trans was made for. I'm only looking to have about 600 flywheel hp also.

  8. #8
    Joe (Moderator) joecar's Avatar
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    It'll work out, let us know how it goes...

    I've heard of tuned units dying, so maybe the key is to leave it as is.

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    A little bump for this thread.

    Anyone know of any swaps from a T42 to T43 in a E38/E67 vehicle yet?

    I've heard of one but, looking for all feedback.

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    Quote Originally Posted by XLR8NSS View Post
    A little bump for this thread.

    Anyone know of any swaps from a T42 to T43 in a E38/E67 vehicle yet?

    I've heard of one but, looking for all feedback.
    T43/E38 combination relatively common.

    I would go so far as to say that the T43 does care what ECM calibration it is talking to. While a non "compatible" pair may work, it is hit and miss.

    The schematics for the 09 CTS-V with LSA show an X3 connector, so it must be an E67. That car runs a 6L90E, so it may be a start.

    Cheers!

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