They are not from the same vehicle. I have no idea what the original source was (I don't have the tune in front of me to verify). The E38 OS thinks I am running a 4l60 which could be an issue? The T42 is definitely a 4l80e OS. Do you have schematics handy that I could use to verify my wiring is correct? The harness was originally built for a 4l80e. I had to swap some pins and add the ISS connector.
I am pretty sure I tried to log VSS while connected to the T42 on the scan tool. I'll try it again.
thanks for the help!