4in vs 4.5in bolt circle rear axle

toolmanmike said
The small bolt 8 3/4 rears had the small pinion carrier so they wouldn't be the strongest. 741 carrier

But the pinion can be swapped out.

Personally I do not see the size of the bolt circle making a difference, that is assuming you are comparing like for like ie 8-3/4 to 8-3/4

Alan