Clunk in the rearend

So the other day I hop in the Polara to go for a drive. Well I put the car in reverse and hear a ping from the rear end. So out of curiosity I back down the driveway and put the car in drive to hear a clunk clunk clunk noise. That's not good.
So I'm off work today and decided I better look into it and this is what I found.
Attached Images
  
Author: Kelgar50