Remove the driver side axle and look closely at the splines to see if there is any twisting of them in the splines, if not your golden Go race the car and look at the axle every other year until it starts to twist the splines, once it twist more then one full spline replace them both with a good set of race axles.
If the splines are twisted now more than one spline now go buy a new set of race axles and look at them as needed every couple of years