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Thread: Tow/Haul mode for 6L80e

  1. 08-12-2011 #1
    iamkeniff
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    Tow/Haul mode for 6L80e

    i have a 2008 gmc sierra that is a 6.2/6L80e swap. i have the tow/haul mode through the transmission but i do not have the TU/TD option. i have yet to figure that out past the wiring that is already installed in my truck. basically id have to have the BCM reflashed with a different vin and id have the wrong vin for onstar i think. id settle for my Tow/Haul mode to engage 2nd gear at a low roll vs having TU/TD, then have it shift through the gears like normal at WOT. has anyone done this with the 6L80e yet?

    thanks

    2008 6.2/6L80e swap
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  2. 08-12-2011 #2
    TimC
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    You can tune the shift mph in normal and tow/perf mode separately with HPtuners. TUTD sucks, it's not worth screwing around with the wiring.
    1971 Corvette-LS3 swap with custom cam. Stainless headers and sheet metal intake built by the owner. 442rwhp.

    2007 STS-V-Billet Precision 67mm turbo swap. 563rwhp@15psi.

    1991 Camaro-6.0 swap with LS6 heads and custom cam. Headers and other swap bits fabricated by myself (wife's car)

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  3. 08-12-2011 #3
    iamkeniff
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    i do have the wiring already in my truck factory, all i would have to do is have the dealer program the bcm but id lose other fuctions that i want. The is no tow/haul tab in the software that i know of other than performance, so how would i set it to select 2nd gear when i press the tow/haul button?
    Last edited by iamkeniff; 08-12-2011 at 09:40 PM.

    2008 6.2/6L80e swap
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  4. 08-12-2011 #4
    TimC
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    The performance shift settings should be active when the tow button is pressed. You could change the shift speeds to how you want them that way.
    1971 Corvette-LS3 swap with custom cam. Stainless headers and sheet metal intake built by the owner. 442rwhp.

    2007 STS-V-Billet Precision 67mm turbo swap. 563rwhp@15psi.

    1991 Camaro-6.0 swap with LS6 heads and custom cam. Headers and other swap bits fabricated by myself (wife's car)

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  5. 08-13-2011 #5
    iamkeniff
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    thank you for you help!

    2008 6.2/6L80e swap
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  6. 08-13-2011 #6
    iamkeniff
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    this is the only 2 tabs i have as a "shift pattern" under *Auto Shift Properties, General tab*
    so i would have to change the "cruise" one to performance an go from
    there?

    2008 6.2/6L80e swap
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  7. 08-13-2011 #7
    TimC
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    Post your tune and I'll look.
    1971 Corvette-LS3 swap with custom cam. Stainless headers and sheet metal intake built by the owner. 442rwhp.

    2007 STS-V-Billet Precision 67mm turbo swap. 563rwhp@15psi.

    1991 Camaro-6.0 swap with LS6 heads and custom cam. Headers and other swap bits fabricated by myself (wife's car)

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  8. 08-13-2011 #8
    iamkeniff
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    yes sir but can you tell me how to?

    2008 6.2/6L80e swap
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  9. 08-13-2011 #9
    iamkeniff
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    Attachment 29909

    i dont know if that works....

    2008 6.2/6L80e swap
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  10. 08-15-2011 #10
    iamkeniff
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    any luck?

    2008 6.2/6L80e swap
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  11. 08-16-2011 #11
    TimC
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    I don't know what to do there. I don't recommend changing any of the stuff HPtuners says not to change. You don't know if there are tables you can't see that will affect the changes in a negative way. I guess you can try to get the TUTD working like you originally thought.
    1971 Corvette-LS3 swap with custom cam. Stainless headers and sheet metal intake built by the owner. 442rwhp.

    2007 STS-V-Billet Precision 67mm turbo swap. 563rwhp@15psi.

    1991 Camaro-6.0 swap with LS6 heads and custom cam. Headers and other swap bits fabricated by myself (wife's car)

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  12. 08-17-2011 #12
    iamkeniff
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    Quote Originally Posted by TimC View Post
    I don't know what to do there. I don't recommend changing any of the stuff HPtuners says not to change. You don't know if there are tables you can't see that will affect the changes in a negative way. I guess you can try to get the TUTD working like you originally thought.

    Yeah i dont want it to blow up muchless break anything

    2008 6.2/6L80e swap
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  13. 08-17-2011 #13
    iamkeniff
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    i got it working thanks to Wheatley

    2008 6.2/6L80e swap
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  14. 08-18-2011 #14
    TimC
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    Post up what you did so future swappers can see it.
    1971 Corvette-LS3 swap with custom cam. Stainless headers and sheet metal intake built by the owner. 442rwhp.

    2007 STS-V-Billet Precision 67mm turbo swap. 563rwhp@15psi.

    1991 Camaro-6.0 swap with LS6 heads and custom cam. Headers and other swap bits fabricated by myself (wife's car)

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  15. 08-18-2011 #15
    iamkeniff
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    I dont really know what he did lol it all looks the same to me. Ill post the new tune tomorrow when i get home

    2008 6.2/6L80e swap
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  16. 09-12-2011 #16
    jguev
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    "Wheatly" houston tuner???
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  17. 09-18-2011 #17
    iamkeniff
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    Quote Originally Posted by jguev View Post
    "Wheatly" houston tuner???

    Yes, but it is spelled "Wheatley"

    2008 6.2/6L80e swap
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  18. 08-05-2019 #18
    lsvt4
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    What did you have to change to get it to work?
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  19. 12-28-2021 #19
    iamdave
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    did i miss something i dont see the fixed tune
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  20. 12-29-2021 #20
    TheMechanic
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    If you go to trans 460 and 461 (CTRL + N) you can select different options for shift scheduling. It is like having different transmissions based on a few parameters like tow haul mode, cruise control engaged, performance, etc. Then go to 15315 and 15319 and do your trans tuning individually.
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