Axles twist. Flanges bend. Part of life. You might limit it by going to 40 spline, but you know at some point you will turn up the power even more, and eventually bend and twist those. If you think all those years of 8,9 and 10 second passes in a 3,500+ lb car doesn't take it toll, guess again. My opinion. Get another set of axles and just keep going.