Hard to tell from the pic's if they are shot or not.. changing them out is not a bad idea. You will need a 12 point 13mm wrench for the 3 bolts that hold the unit hub on. These bolts can be a bitch to get out, so keep that in mind.. think pipe over wrench to give more help freeing them. As well as a 36mm deep socket if you want to take off the hub and remove it from the shaft. Also the whole unit itself is hard to brake away from the steering knuckle so use a long socket on the shaft yoke and then turn the steering wheel to help the whole thing push out.. Will make more sense when you get to work on it.
Also it appear that both pic's are showing lots of oil/grease around the area, any idea what that is causing that?