mechanic58, In my experience that will result in bearings that are overly tight.

Here is a manual for the next model years of trucks, I expect your axle is covered, still used in the newer truck. (click "contents" at the bottom for the whole manual)
http://chevy.oldcarmanualproject.com/gmc/5559mm/5559mm663.html

Look here for other useful manuals.
http://chevy.oldcarmanualproject.com/

Read the manual, but it explains basically hand tight while turning and back off 1/8 of a turn. More detail in the manual..

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-