8 3/4 SBP 10x1.75” Drum Help*

cosgig said
You can’t use those 2.5” backing plates, or any other backing plates from a large bolt pattern axle. They MUST be from a small bolt setup. The small bolt axle and corresponding brake setup has a unique offset that is only available in a small bolt axle. You need to either find a pair from an A body 8 3/4” axle, or you can use the 7 1/4” small bolt backing plates from a 10” brake system, but you would need to drill the 5th mounting hole, as 7 1/4” backing plates and axle mounting plates only have 4 studs, the 8 3/4” has 5 studs.
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Not entirely true. If we're just strictly talking A-body, then yes, but some '66-70 6cyl B-bodies used 10 X 1 3/4" rear brakes too and use the same backing plates as the 8 3/4 SBP A-body. The early numbers are 2533840-1 and by 1968 they are 2880582-3. Must have been a slight design change, but, I've swapped early and late with no issues. It's just that the B-body ones are pretty rare.....even more so than finding A-body ones.