Wheelbase is actually 137"
If you have 5 and 10 lug wheels it is a model 4100 1.5 ton. If they are 8 lug it is a 1 ton.
What do you have?
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-