Narrowing a 8 3/4 diff.

When deciding width...keep in mind big bolt backing plates n drums are wider than A body...
Make sure you do the math you are after on final wheel placement.....
@joesnow I intend to put 11" drums on it. Do you mean that the bearing placement on the axle shaft is different for big bolt and bigger drums? I don't have any reference around for that knowledge. From the backing plates I do have it looks like it's stamped deeper. Meaning the drums will go further into the wheel well.
I will want to make sure before I do it. If you have some more info I would appreciate it.