I cant anwser that question but somehow I do have some kind of rpm reading on my scanner. if im not mistaken, the rpm signal is only for wot shift ? but adding the tach signal made it go into first for some reason .... right now I have all the dtc possible for the shift solenoid, tcc pwm ect ect.

are the 98 and 2002 4l60e incompatible ?! I downloaded a bin file from a 2001 sonoma as well and it was similar. I did managed to get it to start in first on Drive and shift up but it never downshifted back after that. now If anyone know a thing or two about 4l60e tuning on tunerpro can enlighten me on possible mistake I made , I could rule this out and look at the wiring or the tranny it self.