The springs are mounted parallel on a 400 series GMC and they taper in narrower on the 2 ton and smaller AD trucks.
To know if this spindle swap might work on your axle find or measure kingpin diameter and thickness of axle end where the kingpin passes through.

•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-