Originally Posted by truckernix
That ratio change represents a 4% change which is very small.

Sure it is not a 13.6% change between 4.10 and 3.54?
At 65 mph the engine speed drops about 450 rpm, that sounds like a worthwhile swap to me.

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-