Originally Posted by Unca_Sam

Best practice is to replace the balls when you refurbish a hub. 4000 miles is within the lifespan of the balls in the bearing, but it'll be difficult to see if the balls have been stressed out of sphericity with your naked eye. It's your call, but 22 1/4" G25 stainless balls will only cost you around $10-15, and you'll be set for another 2 years or longer.