I would suggest a Dana 70 as a swap, 8 lugs most of the time, good choice of gears up to 3.54.
Disk brakes available.
Often setup for dual wheels.
Good value for the money.
Take your time and shop around, take a tape measure.

•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-