Brake size?
I'm not so familiar with the later axles.
but for a 48-53 1.5 ton axle it has press in hub grease covers, and the 2 ton has covers held on with about 5 small bolts. I don't know if this holds true for the later axles.

But so far as I can tell 56-59 1.5 ton axles are 5/10 lug, and 2 ton is 6 lug Budd.

Some parts manual searching will probably reveal the truth.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-