I’ve bought a few, think $250 is most paid for a real clean one from under a little used RV.
Lots of 4.56, some 4.10, and 3.73 is quite hard to find, I did find one to try.
Any faster gears seems better to buy new than hunt used unless extra lucky.

•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-