One option is use loctite bearing retaining compound to fix the bushings in the spindles and take up that small amount of slop. This, while not how the 1/2 ton axles were intended to be, is no different than kingpins and bushings on all the larger trucks. Some searching will turn up much discussion and more detailed how to.

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-