8 3/4 diff yoke

Dana67Dart said
Is it 471, 472 or 489 case

Sorry, don't mean to insult. You mean, is it a 741, 742, or 489 case.
489 uses a crush sleeve. Op said the shims broke, (and its coarse thread) so likely a 741/742 case.
Edit: I'd clean it up, and reuse it too.