Newbie Here. Need some help on 09 5.3 / 6L80e and e38

[TurboCamaro]

I had a customer bring a E67 controller in with a T42 transmission controller out of different vehicles. It appears the harness is done correctly except I am uncertain of the CAN wiring and associated resisters being required or not.
I was able to pull the cal from the E67 controller however could not access the trans controller. My original thought was that if I could pull the cals I could see what they are and then full flash appropriate cals in.
Is this idea feasible or is the inability to read the trans controller due to the 2 controllers not being paired and need to get them flashed with a Tech II. The end result is a 08 Colorado (or other similar chassis) 2.9L 4 Cyl with a 4L60 that will be turbo charged in a 39 sedan.
Thanks

[ScarabEpic22]

The T42 will take (almost) whatever OS you want, just make sure the OS is compatible with the ECM OS. The ECM OS needs to match the base OS that exists already in the ECM, if you mix n match incompatible OS' you will brick the ECM.