I just measured the Dana 60 rear that I have available. It measures 66.875" from wheel mounting surface to wheel mounting surface.
The original rear from my 52 1 ton measures 62.875".

So, with wheels with about 2" more backspacing than original the ford van axle will work. Or, with a flat bed original wheels would work.

•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-