Axles and re-drilled rear drums for 4.5 bolt pattern

When I did my 72 8-3/4 (small bolt to big bolt conversion) but left the factory 1-3/4”x10 shoes and backing plates / drums (re drilled) I had no issues. (Mosier axles not Dr Diff)

When I did my 66 8-3/4 (small bolt to big bolt) I used 10x 2-1/2 shoes and backing plates / hardware new drums and did have to grind a touch- those were Doctor Diff. But I knew going into it that may happen.
Syleng1