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Thread: 6l90e conversion

  1. #1
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    6l90e conversion

    My question is there a segment swap to install a 6l90e into a 06 2500hd? Has anyone done this already? If so what did you have to go through to do the install?

  2. #2
    Tuning Addict 5FDP's Avatar
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    Not possible with a stock computer or anything segment swap related.

    The P59 never used a TCM and the 6L90e has the TCM that works over canbus with the E38+ style controllers.

    You would need to source a complete standalone controller and harness for the 6 speed transmission. I think someone makes it but I forget off hand.
    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
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    PCS makes a standalone controller for the 6L80/90 applications.

  4. #4
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    Yes but they dont back it up with much help. True Blue motorsports and zero gravity service the customer service end of it. Bought one brain and harness for a low mileage goodwrench trans i picked out of a wreck. Anyway if anyone knows anything about cruise control. Po741 code ( among a dozen others) all now shut off- in HP tuners but cruise Still wont work ... No one will help figure what next move is. Nevermind the trans module glitches, won't read trans temp, shifts hard, or late, or locks in 4th. I know of no success stories in 6l80 6l90 swaps. If i had to do it again, and i might....Put in a 4l80 paired with an np246 and call it good.

  5. #5
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    Quote Originally Posted by 5FDP View Post
    Not possible with a stock computer or anything segment swap related.

    The P59 never used a TCM and the 6L90e has the TCM that works over canbus with the E38+ style controllers.

    You would need to source a complete standalone controller and harness for the 6 speed transmission. I think someone makes it but I forget off hand.
    P59 used a TCM but only with the Allison. I doubt the Allison coding will communicate with the T43. I have actually considered doing some compatibility testing myself. I doubt that it has any compatibility myself but worth checking. Even the 0411 communicated with a TCM with an Allison. I believe the 05-09 P59s actually even used J1939 CAN to control the newer 6spd Allison TCM.
    Last edited by Fast4.7; 09-10-2024 at 12:34 AM.

  6. #6
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    Quote Originally Posted by KennediVon View Post
    Installing a 6L90E transmission into a 2006 Chevy 2500HD requires a few key considerations. First, the 6L90E is about 1.5 inches longer than the 6L80E, which may require adjusting your driveshaft to fit properly. Additionally, the transmission control module (TCM) must be compatible with your existing engine control module (ECM), and you may need to reprogram it for optimal performance. Wiring modifications are also necessary, as the harness may need to be adjusted to accommodate the new transmission connectors. It is important to make sure the input shaft is compatible with your current setup, especially if you plan to keep your existing transfer case.
    Thanks ChatGPT. That was great. FYI, you forgot to put in the spam link to the phone clicker game you're supposed to be promoting.
    Quote Originally Posted by SiriusC1024 View Post
    I think they're junkyard rebuilds.

  7. #7
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    Quote Originally Posted by blindsquirrel View Post
    Thanks ChatGPT. That was great. FYI, you forgot to put in the spam link to the phone clicker game you're supposed to be promoting.
    It is one of the better AI post though.

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    The problem with this mode of thinking where you take all the possible answers, find the average, and that must be the correct answer, is little minor details like there is no 6 speed TCM that's compatible with a Gen 3 PCM. How, exactly, do you 'reprogram it for optimal performance'? HOW? Program it with what? How do you adjust the harness to get a CAN-based TCM to communicate with a Class2-based PCM? It's completely useless at anything other than superficially looking like an answer to people who don't know any better, who seem to be the target demographic for this dumb bullshit.
    Quote Originally Posted by SiriusC1024 View Post
    I think they're junkyard rebuilds.

  9. #9
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    Quote Originally Posted by blindsquirrel View Post
    The problem with this mode of thinking where you take all the possible answers, find the average, and that must be the correct answer, is little minor details like there is no 6 speed TCM that's compatible with a Gen 3 PCM. How, exactly, do you 'reprogram it for optimal performance'? HOW? Program it with what? How do you adjust the harness to get a CAN-based TCM to communicate with a Class2-based PCM? It's completely useless at anything other than superficially looking like an answer to people who don't know any better, who seem to be the target demographic for this dumb bullshit.
    So you are saying that AI has learned to perfectly replicate politicians?

  10. #10
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    Quote Originally Posted by gametech View Post
    So you are saying that AI has learned to perfectly replicate politicians?
    At least some (most?) politicians.

  11. #11
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    Considering there's probably some folks here who proudly sport "Tim McVeigh Did Nothing Wrong" tattoos, probably best to not get into all that. I prefer not to know how disconnected from reality the people around me are.
    Quote Originally Posted by SiriusC1024 View Post
    I think they're junkyard rebuilds.

  12. #12
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    Quote Originally Posted by blindsquirrel View Post
    The problem with this mode of thinking where you take all the possible answers, find the average, and that must be the correct answer, is little minor details like there is no 6 speed TCM that's compatible with a Gen 3 PCM. How, exactly, do you 'reprogram it for optimal performance'? HOW? Program it with what? How do you adjust the harness to get a CAN-based TCM to communicate with a Class2-based PCM? It's completely useless at anything other than superficially looking like an answer to people who don't know any better, who seem to be the target demographic for this dumb bullshit.
    The Zero Gravity TCM-2650 only needs a TPS and RPM signal from the engine that is connected to the 6L80E/6L90E.

    https://www.zerogravityperformance.c...e-6l90e-6l50e/