I just swapped in 4L80E into a 2013 Silverado that was originally 4.8/4L60E
Got the wiring figured - switching over from internal to external PNP switch. It starts and runs, PRNDL indicator works.
I do have 08 Express 6.0/4L80E (from the depository) tune but apparently there is no segment swap for E38 to get 4L80E solenoid pattern.
Do I have to use relay pack or can you just copy over the tune and "encoded bits" will take care of the solenoid shift pattern?
Thanks.