Hello all. I currently have the transmission and irs out of my 03 cobra for some upgrades. Found out the pinion seal on the diff. is leaking. The crush sleeve and nut will be replaced with the new seal. Should I replace the bearings as well, while it's apart? I ask because the car only has 19k miles on it. However with that said, I am replacing all the irs bushings with a full tilt boogie kit. The car right now is in 570whp to 600whp range. Thank you all in advance.