8 3/4 backing plates what to use?
Ok..to reiterate and simplify what's been said: A BODY AXLES HAVE TO HAVE A BODY BACKING PLATES!!! The stock a body axle had a different offset than other rears. Even if you redrill to BBP, you have to use A body backing plates and redrilled drums! Otherwise the drums will hit the backing plates.
If you use cut down B/C/E body axles or aftermarkets like Moser or Yukon, you use B/C/E body backing plates. Later truck drums would also fall into this category.
To make it easy, use the same drums/backing plates as the AXLES.!
Good Luck!