This is a common problem with the 1/2 ton.
If it is truly 0.0625” slop you’re likely looking for replacement spindles, or possibly having custom made bushings

Otherwise if the slop isn’t as bad as you describe follow these instructions and fill the gap with a loctite product.
https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/1163785

•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-