If they DO truly need replacing, you'll need either a mig welder, or a press and bearing collars, to get that inner race out. If you lay a bead of mig weld on the race (Don't weld it to the hub....) it'll just rattle out when the weld cools. Otherwise, off to the press and/or machine shop.
I've removed LOTS of those with nothing but a decent punch and hammer. Just be careful, and tap around and around to keep it "even." Some hubs have indentations at "straight across" to give you a better drive surface on the cup
