[nu2-72]

Edmond, here are the pics I said I would post on the rear discs and the explaination. I started with the factory rear end. 1972 Chevy 3/4 ton 4x4. This is the 10 bolt Eaton HO52-HO72 swap. I removed the axles. Pulled the drums and hubs. Pressed out the studs and removed everything to the flanges and cleaned. The threads were chased and while I was at this, I disassembled the entire rear end. Added a locker, ground all the burrs off the housing and chased the 3rd member and cover holes. Then it was off to the car wash with the oven cleaner and pressure washer. I had a set of backing plates from a 72 Dana front axle. These are the "U" shaped stamped plates with the tin dust shields.
The backing plates on a 1979 3/4 4x4 are full 360 degree x 1/4" stamped steel and allow for much easier machining. The Diameter is still 12.5" rotor and the axle is the 79 Corporate front axle, 10 bolt.