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4l80e not downshifting

Discussion in 'Chevy Trucks' started by jb1390, Jan 27, 2011.

  1. jb1390

    jb1390 Senior Member
    Messages: 710

    What the title says....I can manually select a range, and the truck will go to that gear after quickly cycling through the others. I an manually downshift-from OD to 3 to 2nd, by moving the lever. It won't jump on its own due to engine load/speed, even to the point that it will almost stall out the truck. No check engine light.

    Transmission was rebuilt 2 years ago. I just did a fluid change about a week ago...shifts are smooth and everything feels normal except for it not downshifting on its own like it should.
  2. Davidl79

    Davidl79 Junior Member
    Messages: 15

  3. jb1390

    jb1390 Senior Member
    Messages: 710

    That is some wonderful information. Thank you very much Davidl79.

    For now-the truck seems to be acting just fine. I am going to change the fluid again once we get a lull in weather-and change the filter as well. Looks like it could be as simple as a little crud getting stuck in a valve-adding clean fluid maybe loosened something up causing this issue. I'll keep my fingers crossed for now-the tranny is only a couple years old, I certainly hope they last longer than that between rebuilds.
  4. BigLou80

    BigLou80 Senior Member
    Messages: 558

    mine has gone 200,000 with out a rebuild FWIW