RE: rear brake backing plate
If the new ones are like the old ones you will have to remove the diff cover and pull the retaining clips to pull the axles. If there is another way to replace the part in question I don't know it. Wait for some of the other guys to respond before taking this on.
'06 Rocky Ridge Z71
VR snake charmer, VR velocity stack, Airaid modular intake, 180 Tstat, Hypertech program