Easy to swap to 4.56 which was common in the 3/4 tons.

If you still need faster gears and after you give up looking for the elusive 4.11 consider a 14 bolt axle swap. I think swapping to a 14 bolt from under a cab and chassis GM truck is a very good option. Need to move spring pads but otherwise it's a good match, width is the same or within an inch or so.

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-