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Thread: 4L80E shifting problems

  1. #21
    Join Date
    Aug 2008
    Location
    North Texas
    Posts
    12,078
    I see...yes, I guess that makes sense with 2WD tune....unless the pulse count is different.

  2. #22
    Join Date
    Sep 2008
    Location
    Boise, Idaho
    Posts
    39
    There is a reluctor ring in the back slot, we checked it out and it is a 40 tooth. I just don't understand why it has the 2 sensors and it still won't shift.
    A drunk mans words are a sober mans thoughts

    1984 GMC Sierra Classic 3/4 ton 4x4
    Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD

  3. #23
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Is there a reluctor ring in the front slot?
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  4. #24
    Join Date
    Sep 2008
    Location
    Boise, Idaho
    Posts
    39
    As far as I know, that sensor was there when I bought the engine.
    A drunk mans words are a sober mans thoughts

    1984 GMC Sierra Classic 3/4 ton 4x4
    Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD

  5. #25
    Join Date
    Aug 2008
    Location
    North Texas
    Posts
    12,078
    It's got to have something to do with the tune compared to switching from 2WD to 4WD I'd bet.

  6. #26
    Join Date
    Sep 2008
    Location
    Boise, Idaho
    Posts
    39
    So do you think the guy I originally sent my PCM to did something wrong?
    A drunk mans words are a sober mans thoughts

    1984 GMC Sierra Classic 3/4 ton 4x4
    Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD

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