I have a 2010 Challenger SE. The V6 was replaced with a 5.7 from a 2013 Charger Pursuit with 6.1 heads and cam, Nag1 and 3.91 LSD. I swapped the 3.91 diff out to a 3.06 and now it won't shift gears properly and is stuck in a running gear. My programmer guy reset the trans adaptives which put it in limp mode sticking it in 1st gear. I swapped in a spare TCM I had which got me back to the running gear at least. It is retiring showing TCM incompatible. A local transmission shop said that is my problem. It used to show this error when it had the 3.91 in it but never had the shifting issues. I don't want to just start buying a bunch of TCM's hoping one will take. How do I know which TCM will work or do I need to get an ECU and TCM together that came out of a 2010 RT? Please help, I feel like this car is possessed, it will work eventually but till it decides to do so it will torcher me as much as it can.