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Thread: TCC lockup for 6th only?

  1. #1
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    Default TCC lockup for 6th only?

    I have read somewhere that for a stock application it is better to only lock up the converter in 6th gear in a 6L80/90

    Is this true?

  2. #2
    Lifetime Member Tre-Cool's Avatar
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    nope. it's really application/car dependent. i lock up my blown 6.8lt from 4th with a 3500 converter from around 63kph.

    stock converters are generally around the 1800rpm for stall speed, so are reasonable tight already.

  3. #3
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    Thanks, This is in a truck, almost always loaded and owner has a heavy foot but seems to stay under the tp or load that unlocks the converter.

  4. #4
    Joe (Moderator) joecar's Avatar
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    At light to light-medium throttle, lock the TCC in the top 3 gears (generally the TCM will cycle thru the first 4 gears pretty quickly)... in the long run it will extend the life of the ATF and the clutches.

  5. #5
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    Quote Originally Posted by joecar View Post
    At light to light-medium throttle, lock the TCC in the top 3 gears (generally the TCM will cycle thru the first 4 gears pretty quickly)... in the long run it will extend the life of the ATF and the clutches.
    Do you by chance have a calibration I can look at with your suggested adjustments? Would be great to look at one and see it in the rom as a comparison. I have a stock truck 6L80E I am trying to sort out a little bit. Thanks in advance.

  6. #6
    Joe (Moderator) joecar's Avatar
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    Post your TCM file.

  7. #7
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    Quote Originally Posted by joecar View Post
    Post your TCM file.
    Thanks bud, I posted it over in the shift change thread.

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