4.10 is best ratio available for the Eaton axle in the 3/4 and 1 ton as explained in above linked tech tip.

An alternative axle swap very well suited to the 3/4 and 1 ton can be found here, ratios as fast as 3.21 available if you have engine and brakes to need that fast, all the regular ratio choices available too.
https://www.stovebolt.com/ubbthread.../14-bolt-axle-swap-info.html#Post1249600

•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-