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Thread: TCC lock up

  1. #1
    New Member
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    Cool TCC lock up

    I would like to know if it's posible to lock up the tcc in 2 gear now with the new 7.5 ver. or do i have to use a copilot to do so???

  2. #2
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    Take a look at D5010 and D5065...The TCC will lock up in 2nd gear in T/H, normal mode does so in 3rd...
    2007 CC/SB 4WD, McRat EFI Live, Trans, Trans Cooler and C3 clutch oiling mod by Mike L., SD Sleeves, SoCal Diesel

    2002 CC/DRW 2WD, McRat EFI Live, Trans, Trans Cooler and C3 clutch oiling mod by Mike L., SoCal Diesel

  3. #3
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    I am sorry did not explaine my self. It does not lock fully or all the time when i am drag racing ,Even with the t/h. i try to adjust it at the lowest mph i can but still won't lock that low when i am drag racing.

  4. #4
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    Seems to happen when running bigger HP tunes...I've raised shift points to 3600 RPMs and the TCC locks more consistently...Make sure the ECM tune gets adjusted accordingly...
    2007 CC/SB 4WD, McRat EFI Live, Trans, Trans Cooler and C3 clutch oiling mod by Mike L., SD Sleeves, SoCal Diesel

    2002 CC/DRW 2WD, McRat EFI Live, Trans, Trans Cooler and C3 clutch oiling mod by Mike L., SoCal Diesel

  5. #5
    Lifetime Member DURAtotheMAX's Avatar
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    there is a missing table that prevents this when drag racing with big hp. :(

    you can set the converter to lock at 20mph in 2nd gear, but it doesnt listen.
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  6. #6
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    It feels that way with mine but in the logs I have it says it is locked all the way through starting about halfway through second.

  7. #7
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    I just looked at my log and it looks like it isnt locking untill 3rd. From a stop the duty cycle will jump to 73% for a thenth of a second in second gear then unlock again and not completly lock untill 4th.

    In one run it locks but only locks with about 75% duty cycle then unlocks again in 5th?

    Ive heard rasing shift points to about 3600 helps I have my shift points about 3400rpm.

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