Ken,
Darn, you're paying attention......
I don't have any special references on hand, I can only speculate how they work. If I remember correctly, these trannies use electronic solenoids to shift, monitor govenor pressure and control TQ lockup, as well as a geartooth sensor for speedo output. I don't know if the tranny sends discrete analog/digital data to the PCM from each sensor/solenoid, or if it uses a CAN bus. I'd imagine it'd be a somewhat daunting task to control the tranny if you don't know what signal conventions are used.
http://www.4l60-e.com/ http://www.sallee-chevrolet.com/Transmission_Control_Modules/4L60E_4L80E.html http://www.compushift.com/ http://www.pdqparts.com/content/pdf/CUA0102-1.pdf If you get a chance, email me as I'd like to know how you did it, what micro you used, etc.
hope this helps
chip
