it's possible the diagram may be available from the ATSG site, but i don't know if you have to join that group or not.
i have bought manuals for the A500 and A518 from them, but nothing for the RE transmissions.
with that said, i looked at a transmission diagnostic book i have for minivans. yes, i know this is an entirely different thing, and has no bearing on a rear drive application.
however, looking at the wiring diagram, the transmission plug has ground and sense wires going to the computer, and it shows the pin out and diagrams for both, as well as the wire colors.
i'm ASSuming the RE transmission would be similar, but that's as far as i am able to go with any help.
i have no idea if this was worth anything, or if i just threw rock in a mud puddle.