Rear wheel bearing

See pics, tool might be rented at auto parts. Once axle is out have autoparts replace bearing as it needs to be pressed on. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

I would never change just one. Metal chips have gone through everything.

Don't cheap out. Do the job the way a conscientious mechanic would do it if he was looking out for your best interest. Replace both bearings and both races. The parts are not very expensive.