This is our upgraded 1000HP rear axle set for the GTO platform. This set of axles has the thicker Porsche style 108mm CV and hardware that is 40% stronger than the factory design. These axles feature our new 300m center bars with rolled splines. For those of you that dont know rolled splines are stronger than the traditional cut splines. They are as much as 35% stronger than a standard cut spline along with better fitment. This set of axles has a chromoly cage (just like some of the other manufacturers "high end" axles. Add our 4340 Stubs and you have complete system capable of breaking the diff. Need something stronger ? check out our 30 spline 300m axles or the new 9" (also with the 30 spline 300m bars) If you want better axles with a larger center bar and 4340AQ CV cages with a 300M center race, see the 1400HP axles. This is a direct fit axle and will handle most powerful street and track cars. These axles will bolt directly to the factory differential stubs and include new hardware for installation.