A modification that I like for the 1/2 ton king pin bushings is to fix them in the spindles as they are on larger trucks. This eliminates a wear point and can correct a little bit of a sloppy fit.
To do so I use Loctite 660 to fill the gaps between the bushing and the spindle bores. Be sure while the goo sets the kingpin is inserted in the bushings to properly align them.

More reading on the subject, with more links in there
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=877454

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-