[trf63]

Originally Posted by clinebarger

You can run a factory T42 TCM with your E38 ECM. A OS from a '08-'11 6.0/4L80E Express Van flashed into to both modules will be a good starting point. Not sure about segment swaps with this?

Adding the T42 to your existing set-up is EASY!! The only 2 circuits you will have to mess with on the engine harness are the 2 CAN/Bus wires at the DLC,

The CAN/Bus will come out of the ECM to the TCM, Then out of the TCM to the DLC...Instead of out of the ECM straight to the DLC.

Wire up the Powers & Grounds, ISS, VSS, Range switch, Then the harness to the trans plug.

Factory TCM's can be tuned with HPTuners/EFI Live on top of factory support & diagnostics, I'm not knocking aftermarket controllers, They have their place.....Just not on LS engines.

good info. thanks!