All depends on vehicle weight and how hard it "hooks"unless your getting close to the 700hp mark a good stock 9inch will hold up all day long. It should be pulled apart and make sure it is in good condition. The 31 spline axles in good condition will hold up to 750hp the weekest link is the center section. With that being said the stock 9 will hold up just fine with a mild 460 in front of it.