Not sure if I notice any difference with the top shaft but it does seem like my buggy jumps flatter now with the centering kit. I notice before on certain jumps the buggy would get a little sideways coming off the jump. Now even same layout and same jumps it will jump flatter. I did the esc shelf at the same time. Don't know if it was just centering kit or a combination of both or just me wanting to think it is better.