He has a transmission on a boat coming to the US right now and I have been casually talking to him about the swap. I have been sharing the information I have found so far, some he doesn't agree with but he can find that out for himself when it he gets to it. Thank you, I have put a lot into this mainly because I want it to happen but getting the credit would be nice too. Thankfully if the differential controller doesn't work out I have the aftermarket one that can be used even if I have to use that as a temporary solution in the meantime. I need to do some can logging to see if what information goes back and forth between the tcu and diff controller. It's possible if I have to I can spoof the tcu messages to keep the diff controller functional. .I figured Lars would have some serious interest in doing the swap. I can't see a Rally car being FWD, no matter how much I try. Hope you get it done but either way you were rolling on this first so IMHO you get the credit. If you can get that differential controller rocking, that would be a bonus. Is the ECM issue related to the AWD aspect and ABS or something, I'm trying to figure out why a FWD ECM wouldn't work. Sorry, I'm behind on this thread.