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Thread: 6l80e help with TUTD holding gear

  1. #1
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    Default 6l80e help with TUTD holding gear

    Hello all, I have a 2008 Jeep wrangler swapped with an LS3 and 6l80e supermatic. E38/T43 combo for ecu/tcm. The last bit I need to figure out to get it perfect is the ability to hold the trans in a certain gear. Currently TUTD works like a max gear selector, and no matter how I alter the TUTD shift control tables, it still behaves like that. The OS on the TCM is 24256125 and the ECM is 12639835.

    I am assuming the ability to hold a gear with TUTD is in the OS itself rather than in the tune? Can I get any guidance as to if that is correct, and if it is, what kind of OS would accomplish what I'm looking for, and is it compatible with my ECM.

    Attached is my current 6L80 tune.

    Thanks in advance. T43wh1_0025.ctz

  2. #2
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    Look at D9602
    Thats the first thing i noticed.

    If that doesnt work the TCM OS might not work with TUTD.


    NOt sure if this helps..
    https://www.google.com/url?sa=t&rct=...O&opi=89978449

  3. #3
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    So with d9602 set to enable TUTD doesn’t work at all. I put it in M mode and the switch does nothing. When I switched it to disable is when it allowed me to select max gear as I do now.

  4. #4
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    From that chart my TCM OS is from an 11+ Camaro and the ECM is from an 11+ truck. My assumption is the 11+ Camaro tcm should be capable of gear holding with tutd. Is that correct?

  5. #5
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    it Should be.. But do you have a way to see the TUTD inputs from the switchs?

  6. #6
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    They shift the gear on the dash, from 1-5, but it just acts as a max gear rather than how a manual works holding the gear. Is there another way to check the switch function? I can pull up a scanner and see if they’re on there.

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    Ive never tried. Just throwing out ideas haha

  8. #8
    Lifetime Member Tre-Cool's Avatar
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    i have a lot more parameters defined for this os then efi/hpt has now.

    how is your tapshift activated? via bcm or some other module or is it hardwire like the corvette?

    I have had a sneaking suspicion that a couple of the shift options might not be correct on that os. I use it in a couple of my cars along with 24256025 (flash compatible).

    before you try another cal, try adjusting the TUTD (D1004) upshifts to get away from being maxxed out. then for the downshifts put your 6-5 shift at 40mph & do similar for the rest leaving the 2-1 at 0 & report back.

    oh & is it running a factory gm transfer case etc or purely rwd with the original jeep transfer with an adapter?
    Last edited by Tre-Cool; February 27th, 2024 at 04:06 AM.

  9. #9
    Lifetime Member Tre-Cool's Avatar
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    i have changed 1 parameter in this file via a cax file the other 2 changed settings were to turn tutd on as if was controlled via bcm.

    test it out.T43wh1_0026.ctz

  10. #10
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    Tapshift is done through a Canbus gateway that was made. I logged the tap up and tap down through efilive and they are coming through properly.

    I put the stock ctsv TUTD upshift/downshift table in and still no dice.

    It has a jeep transfer case with an adapter.

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