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Thread: 4L80E Reference Material

  1. #21
    Joe (Moderator) joecar's Avatar
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    Default

    Here is some 4L80E info: sloppywiki/everything-ls/4l80e-info

  2. #22
    Joe (Moderator) joecar's Avatar
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    Default Shift curve relationships

    PT shift table relationships:

    basic relationships:
    1->2 curve should be above 2->1 curve;
    2->3 curve should be above 3->2 curve;
    3->4 curve should be above 4->3 curve;

    additional relationships:
    3->2 curve should be above 1->2 curve;
    4->3 curve should be above 2->3 curve;

    this can be summarized as: the curves cannot cross anywhere;

    if they cross anywhere, then you will not be able to predict what gear the PCM selects when the operating point hits the cross.

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