In my experience the 4.10 gears for the Eaton axle will also be found in other trucks. Perhaps many are in those 68 to 72 3/4 tons.... but I’m not so sure why that’s all anyone talks about when looking for the 4.10 gears.
Open your search for any truck with the same axle and check the ratios as you find them. Same goes for any axle/gears you find, check the ratio to be sure.

Also check the Tons of fun section sticky thread for ideas on swapping a more easily found 14 bolt axle into your truck.

•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-