I made that change in my 52 1 ton and it was great for around here where we have hills. If you gear it too fast you loose the ability to haul lots of weight with a small engine, or even just the truck empty if geared real fast and you have good hills to climb.
On the flat I could easily travel 50-55 mph for hours and hours with a 55 model 235 and 4.56 gears, made an 8,000 mile trip in 28 days counting stops.

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-