Tests not done!

Ok, everything can be tested in-car. I need you to pull the VB and run the full suite of air tests I provided.

I suspect the 1-2 slip is a bad servo seal. Which model servo is it? Full rubber embossed type or aluminum piston with square cut o-ring?

2-3 flare can be checked by the rev-high air test.

The wrong application of pieces can result in more than one symptom occurring. Usually if the tranny is running great and something fails then it can be pinpointed down to a single item failure.

HTH