For that matter swap the whole axle, it'll be as cheap or cheaper than having adapters made.
It'll come with disc brakes.
If you get a Dana 70HD you've got gears from 3.54 and slower.
If you find a Dana 80 you've got choices from 3.31 and slower.

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-