There is no matching operating system to splice in a 4L80 segment, so we had to use a stand alone TCI trans control, but it doesnt jive with the drive by wire throttle body. So, we added a stand alone TPS to the throttle body.

 

Should have made the H2 think it was a truck done it before and it worked well.

 

we were worried about using an operating system that didnt match the Hummers.