Take this as correct untill someone says it is not...

For AD trucks
If you have 8 lugs for your wheels it is a 3/4 or 1 ton.
If you have dual wheels with 8 lugs it is 1 ton, and you probably have 18" tires / wheels with it.
If you have 10 lugs and no 2 speed it is probably a 1.5 ton. However, 2 speed was an option for 1.5 ton trucks.
If it has 10 lugs and 2 speed it is 2 ton.

Why do you need to identify your axle?
What exactly do you need to know about it?

•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
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-