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4l80E help

Discussion in 'Truck & Equipment Repair' started by shawnmartin, Mar 20, 2009.

  1. shawnmartin

    shawnmartin Junior Member
    from fl
    Messages: 1

    hello i have a 95 gmc 2500 trans has been working great with no problems turned truck off and started 30 min latter and all gears are forward even in park you can feel trans dragging eng down when revving eng up any ideas thank you shawn
  2. stroker79

    stroker79 2000 Club Member
    Messages: 2,802

    Sounds like the tourqe converter is locked?

    I think there is a TC pressure regulator on the trans, maybe that is bad.
  3. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If it drags even in park/natural then you have a hard parts failure.

    If it was the TC causing the issue it wouldn't drag in park/neutral since no clutches are applied in those positions in order for it to drag (even if the TC was applied). More like an issue with either the forward or 4th gear clutch assemblies stuck engaged...likely a stuck apply piston, not at all unheard of in the 4L80E's.