It is a 09 GMC Canyon 5.3, 4L80 swapped, with an OS of an express van with 4L80 in the T42 starts in second gear but the signals on the dash are correct. (OS: 24239927). I found help with someone who did it in an 07 TBSS (OS: 24235341), the four shifts works fine, starts on first shift now transmission all fine. But this problem starts when in the dash I haven?t speed signal and TR signal freezed, speed 255km/h and TR signal is 1st gear all time.
*(I don't want to use relays with 4L60 OS)
Tell me about your 4L80 swaps on e67 ecu?