We just installed an A and A Torqueflite in our Road Runner. There is quite a difference between my home built torqueflite with a Turbo Action transbrake and the transmission from A and A. The A and A has all the best internals. The A and A is more positive in all gears. The transbrake is more positive when it engages and most importantly, the car is quicker with no other changes. If you haven't talked to Rick Allison, you should. He knows what he is doing. As an aside, my son and I went and saw Rick's facility. It is one of the most impressive shops I have ever been in.