I have decided to let go of my built t56 for a auto. I am building a single turbo 03 cobra. My question is I want to get a nice transmission for a street/strip car. The car will be at the 1,000 wheel hp range. I like the thought of the 4r70 with the OD. I know a lot of people go with a th400 but it has no OD. The 6r80 is a pretty high dollar set up and I really like the thought of shifting since I really like the manual transmissions. I just know the auto is the way to go at this point with a turbo so I am gonna do the right thing and go auto. So guys please give me the ups and downs on different transmissions and which you guys prefer.