I am doing a little tuning work on a 2008 Silverado (5.3L w/E38, 4L65E w/T42) and was trying to download the current transmission adaptive shift cells. I connected to the truck, selected T42 and tried to use the function (\ Calibration \ Auto transmission adaptive shift cells), but it was greyed out. I disconnected, and re-connected selecting the E38 ECM but also checking the Automatic transmission check box. Same thing ... the Calibration \ Auto transmission adaptive shift cells was greyed out.
Is there a way to download this information from a T42? I have used this function before with a LS1B PCM.