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Thread: Applying car OS to tahoe w/T42

  1. #1
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    Default Applying car OS to tahoe w/T42

    As the title says, I am looking at switching the OS in my '07 Tahoe T42 4L60 w/2600 stall to the f-body OS mostly for the ability to keep the TCC locked during coast/0%tp. It gets annoying at times especially in stop and go traffic. I am definetly a newb at switching OS's is it as simple as finding a car with the proper OS and running a script over my stock tcm file??

  2. #2
    Joe (Moderator) joecar's Avatar
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    My understanding is that the F-car OS (engine/trans segments) won't flash into the T42 (trans only segments)...

    I'm not sure what the TCC coast behavior is with the Y-car T42... if it keeps it locked then try that (if OS is compatible with your TCM).

  3. #3
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    Thanks, I found some of that after some more reading, but haven't found anything on the coast behavior either...where do you recommend I search for a similar y-car T42??

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    Joe (Moderator) joecar's Avatar
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    I think the 2005 Corvette had a T42... might ask on the Corvette forums about the TCC coast behavior speficially with a T42... but then it still has to be determined if that OS is compatible with your T42.

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    Hmmm...looks like you gave me some work/research to do...I thank you old wise one!

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    Use an 06 GTO or Holden Commodore T42 file. Basically you need a car T42 OS instead of a truck OS, Ive got a few files I pulled from HoldenCrazy.com but havent had time to copy my T42 settings into the GTO file yet.
    ~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.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  7. #7
    Joe (Moderator) joecar's Avatar
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    Do the GTO/Commodore 4L60E controllers keep the TCC locked on coast...?

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    Quote Originally Posted by joecar View Post
    Do the GTO/Commodore 4L60E controllers keep the TCC locked on coast...?
    At least the T42 ones do, so I assume the rest do as well?
    ~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.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

  9. #9
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    Just wanted to update this...I haven't located a trans. segment that will work with my tahoe, yet. What I did do to keep it from locking/unlocking in stop and go traffic is I only have it lock in 4th. By doing this it has helped out a lot, most of the time I was only in 3rd when it happened. I am pretty happy with it, but will continue my search for the proper car trans. segment.

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    Does it mess up your cluster readout (ie read you're in 1 while you're actually in P)? Im on a quest for the same thing on my TBSS, the files I have dont seem to work with my 08 TBSS, worked just fine on my friends 07...
    ~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.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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