The 5R55 series was completely computer controlled. It's a fully OBD-II compliant trans with codes and shift solenoids and everything.
My advice, if you have your heart set on getting away from the A4LD but want to keep a Bordeaux tranny, get a 98 4.0L, all it's wiring and the computer, and a 4R44/55.
I have gotten wind of a few people trying to make standalone controllers for the 4R/5R series transmissions.