Yes, he said rear axle and most all vehicles 3/4 ton and larger (including our AD trucks in question) will have "full floating" rear axle. this means that the hub has two sets of bearings each and fits on a spindle made on the axle tube, very much like the front axle, except the spindle is hollow and the axle shaft slides in the middle and bolts or is otherwise fixed to the hub.

Fig. 20 illustrates the hub and bearings.
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0411.htm

•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-