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