Check your service manual... the 1/2 tons have fully floating bushings, they slip in the spindles and are free to move, not press in, and they're also already a slip fit on the king pin.

You can make oversize bushings.
A decent solution if not terribly worn is Loctite 660 to fix the bushings in the spindles.

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=732207

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=819843

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-