I am going to be running a fordstrokers 408 in my 93 fox. The car will be a 5 spd. The car will hopefully be making 500-600 flywheel hp. Should I upgrade to the 31 spline trak lok? I want 5 lug axles. The car will be mostly a street car occasional drag car. I will most likely run either nitto dr's or bf goodrichs. Do I need the 31 spline, or should I just get a set of hardened 28 spline and save some money?