I am currently piecing together an LS2 GTO swap. Car came with manual T56 originally.
Now we are going with a auto. I have a good 4l60e 13 pin.
I have the stock E40 ECM from the 2005 GTO with a manual OS, I will segment swap this to a 2005 auto OS.
Also managed to source a T42 from a 2005 LS2 GTO auto.
However, do the GTO use a 13 pin 4l60e or a 15 pin? When I look at the stock tune all the ISS related stuff is disabled.
Can anyone shed some light into the topic before I order the auto harness.