Yes. That is how I understand it too. In a light-weight car such as a nova, that doesn't see major strip time the m-20 should be ideal. That is what I got.Correct me if I'm wrong but I thought only the M-22 was considered the "rock crusher" because of the distinct whine it made using straight cut gears. I think the M-21 is just a close ratio Muncie and the M-20 is a wide ratio