Some tidbits about replacement rear axles in this tech tip.
https://www.stovebolt.com/techtips/bigbolts/p30swap/
Better idea (than in above tech tip) for disc brakes on the front in this thread.
https://www.stovebolt.com/ubbthread...4-1-1-5-and-2-ton-trucks.html#Post725027

•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-