Don't know if it works or not, but investigate a 48-53 1/2 ton axle with disc brake conversion.
But you'd loose the 1.5 ton truck capacity and the dual type wheels up front.

For a more substantial axle swap read through this Tech Tip and check out the axle pictures
http://www.stovebolt.com/techtips/bigbolts/p30swap/

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-