The E4OD has no PWM TCC untill the 4R100 diesel.
If there was any slip in the tranny/converter the OD light should flash and set a code and go high line(harsh shifts). If TCC was commanded off then there would be no herky-jerky also, don't ya think? Weak springs in the dampening maybe, once TCC locked.
I would say engine runability.
Just trying to help