Thanks John,
Not sure what to have you measure. We've already confirmed the axle width from WMS to WMS is the same, and spring perch locations too.
I was more thinking looking at them side by side might notice any difference.

Again though, pretty sure I have posted the necessary information in the first post. Various pages from the parts catalog, is there a better source to reference?
What I really need help with, and or a second opinion on, is do these pages and part listings confirm that they're the same axle except stud length? I think so but I could also be wrong.

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-