What's the goal, 8 lug wheels, different brakes, or??

Might save you some head scratching to read about these spindle swaps for the old trucks using newer GM parts.
https://www.stovebolt.com/ubbthread...4-1-1-5-and-2-ton-trucks.html#Post725027

My goal was modern disc brakes.
The swap/update works real easy by simply reaming the existing kingpin bushings in the donor spindles and fitting the original truck/axle king pin bushings (buy a new kingpin kit) inside them, then ream to fit the king pin as usual practice.
This works with the original 10 lug on 7.25" bolt circle but now with 5.25" center bore.
GM had similar axles/hubs with 8 lug dual wheels that fit these donor spindles, so that is also an option.

•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-