the NA rear. Ive spoken to several poeple and its a cheaper and maybe a easy solution to the axle from braking. I havent been able to launch like i want to becuase of the rear so im ganna send my spare axles out after the holidays so nothing gets lost due to the holiday shipping rush. SO far ive been told from one person that they alwayw broke there axle and now they havent broken any since treated. also its been said to increase strenth at least 25%, and its only betwen $40-60 per axle which is a lot cheaper and easy then swapping out a whole rear for a tt rear. I think it will work . GOod luck with yours.