Also reference parts book, these pages
http://chevy.oldcarmanualproject.com/parts/1929_54/379.htm
http://chevy.oldcarmanualproject.com/parts/1929_54/380.htm

The 1 ton axle beam and spindles I believe are very same parts as 1.5 ton standard front axle (excluding heavy duty axle option).
They have the same front spring width at 2" and will physically interchange.

The 3/4 ton has 1-3/4" springs, so even though the 3/4 ton axle beam is the same forging as the 1 ton and 1.5 ton it is not interchangeable, it is drilled for different springs (u-bolt width).

Curious about 2 ton? Different axle altogether, but the axles will bolt in or swap from 1 ton through 2 ton if you try. Again all have 2" springs. They're just not the same axles as far as brakes, spindles, wheels, and such.

•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-