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4L80e in Hummer started slipping when warm....

Discussion in 'All Other Transmissions' started by Sand, Mar 28, 2018.

  1. Sand

    Sand Active Member

    183
    183
    Mar 27, 2016
    Canada
    Still picking low fruit - found a transmission service bulletin that suggested an optical sensor can create these symptoms.
    Un plugged it. Starts hard. Ran fine up to 110 deg then slipped.
    Looking at pricing the valve body kit. Any benefits to the HD version for me?
     
  2. Sand

    Sand Active Member

    183
    183
    Mar 27, 2016
    Canada
    And just for kicks I ruled out PMD by swapping in a good one.
     
  3. Sand

    Sand Active Member

    183
    183
    Mar 27, 2016
    Canada
    Would this work for diagnostic purposes to identify my issue before I do a rebuild?
    Screenshot_20180405-133736.png
     
  4. Sand

    Sand Active Member

    183
    183
    Mar 27, 2016
    Canada
    And rockauto has the shift kit too. Get the manifold and the kit to see what happens or just the kit?
    Screenshot_20180405-135551.png
     
  5. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,929
    2,222
    May 9, 2008
    ZEPHYRHILLS FL
    The pressure switch manifold is just a set of on off switches, and simply tells the ecm what gear is selected and the actual position of the shift valves. It doesn't measure actual pressure. And most shift kits do not include the pieces to fix the afl. The sonnax kit is roughly $45, but the tool set to install it is $300. I'm not sure how much the transgo kit costs with the reamer, but no kit to repair it is cheap because of the reamer cost.
     

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