Quote:

I'm going to a spool with the BBP axles that DR Dif sells on here. I currently have a sbp 8.75 I was told I was gonna need to get a set of b body drums and backing plates. I'm just wondering why?



SBP A-body brakes have a different "offset". The wheel bearing is machined at a different location, the brakes are smaller and the drum register is smaller, all specific to the 4" bolt pattern.

You could have gotten the new axles machined for your existing brake set-up using a 4.5" bolt pattern, but you'd have to redrill brake drums every time you changed them, IF you could find them and related parts at a reasonable price.

10" B, E, BBP '73 & up A body and F-body are basically the same. M & J body too, I believe. All much easier and cheaper to find replacement/service parts for.