I rember the rule of- the axle should handle twice the torque of your application. An aftermarket replacement inexpensive axle like yukon or better -mark williams masterline (street)are rated for 9.90 cars. Your first launch in a "9.90" car would scare the pee out you. The 28s with the locker are fine for 500hp with a 10inch tire and yukons. Race axles are not for daily driving nor is the spool. I use a 460 roller motor with a 175 shot on 31sline/locker/masterline with a huge safety margin- ie upgrades on engine! Have fun! I would not use old oem axles on slicks. At least not too many times -lol..