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Thread: Tuning trans pressures

  1. #1
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    Feb 2008
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    Default Tuning trans pressures

    My built 80e seems to still shift too hard. Actually seems really random at times with its shift firmness. I keep reducin the base pressure on the shift. THe force motor table is stock also. Im sure it has a valve body kit in it as well. Is there any thing else I can do to lower the pressures. Ive gotten a bit worried there too low, I assume a good shift means that I shouldnt worry too mucha about the values though.. The shift is still firm though. THoughts?

    Ive also lowered the shift firmness low enough it wont shift WOT on the 2-3
    Its mainly the 2-3 shift. Really harsh, 80+MPH chirps.

    KBracing got me to add shift times, which greatly helped my PT shifting firmness.

    Tune and log. Look around frame 460.
    Attached Files Attached Files
    Last edited by charcold-bowtie; March 3rd, 2009 at 08:58 PM. Reason: log added
    '04 ecsb Chevy: 4.8L turbo ,EFILive tuned

  2. #2
    Joe (Moderator) joecar's Avatar
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    Apr 2003
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    Default

    Put the shift pressure tables back where they were, and instead increase the shift torque reduction tables D0801-3.

  3. #3
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    Feb 2008
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    Does that table pull spark or which parameters does it act on? I will have to try that. Im just trying to avoid cutting the tps signal down during shifts.
    '04 ecsb Chevy: 4.8L turbo ,EFILive tuned

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