The frame for a 4100 is essentially a 1 ton frame with different front bumper mounting details.
The frame for a 4400 is the same as a two ton 6400.

The short wheelbase 4100 frame is physically smaller than the longer wheelbase 4400. Just as 3B describes.

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-