The 3/4 ton may have a partly enclosed driveshaft, just a short piece behind transmission.
A torque tube is rigidly attached to the differential, in it is the driveshaft, 1/2 Tons have those.

For your 8 lug axle you will enjoy 4.10 gears as explained in the tech tip.

•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-