We lost none, at all... I really dont think that the 56 is going to be a big enough drop to make a difference, I think I gained maybe 200 or so rpm. So I still feel that you would hit the rev before the line. I ended up going to a 4.30 and the car picked up a little more on top end, and again lost nothing in the 60ft. Thats with a 30" tall tire..