GMC does not stop at 2 ton.
You were hoping for help here, did you follow the links I provided to applicable shop manual pages? Were they not helpful?

I've not seen a torque listed very often for the outer lock nut on rear spindles. I run them up gently/snug by hand and a little bit more.

•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-