Brakes interchangeable for 8 1/4 & 8 3/4?

Complete 8 1/4 a body brake assemblies are a bolt on from drums to backing plates. Assuming your 8 3/4 housing is a body width, you then order a body big bolt pattern axles (dr diff is recommended) with you desired flavour of green or tapered roller bearings and bolt ot together. I have done this, it works great.