If you really want to go about doing this, forget swapping the transmissions between cars and find a manual from a parts yard or eBay. You'll still have one car to drive around while doing the swap and instead of trying to get two cars to work, you can focus on getting the SRT6 going strong with an aftermarket engine ECU. I'd love to see you get this working and wait patiently while you write up the procedure and parts required. Feel free to bounce any questions off me. Good luck and you have my two thumbs up!