Consider that the AD 3800 and 4100 use the same frame in every detail except how the bumper mounts.
The leaf springs in each truck also position the axle in the same place front to back.

No problem

•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-