Normal frame width for new trucks is about or exactly 34" outside.
The frame width on an AD truck is 36" outside.

So you can't go to new with the donor frame. How long after AD trucks, if any, did frames stay 36"?

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-