8 3/4 rear sbp to bbp help needed plz

Re-drilling the stock sbp axles means re-drilling the stock sbp drums and keeping the sbp brakes. Which is fine, but stock sbp drums are getting harder to harder to find.

New axles will get you the BBP, but most also use the 10x2.5" BBP brakes, which is a real plus in my opinion. Parts for those brakes are much easier to find. Keep in mind you need the 10x2.5" BBP backing plates for that brake swap because the offset is different for those backing plates than the offset on the sbp backing plates.