I have the 5R55E in my 02. Had shifting problems taken care of while still under warranty. There's still a hard shift from first to second, after a hard launch, usually trying to make the advanced green turning light. The next 3 or 4 stop lights will have a hard shift into second after that, somewhat like a cooling off period. Can't figure it out.

Anyway, someone posted about a shift kit that would help my symptoms. Haven't looked into it yet, but still in the back of my mind.