Don't know about tractors, but as I recall '73 to '80 half ton Chevy pickups with full time 4wd had 3:08 in front and 3:07 in the rear. That would have made the rear slightly taller than the front.
When I questioned it during the era, I was told it was simply the way the gears had to be designed to keep the front differential from being overly large. The full time transfer case with it's own differential compensated for it, anyway.
Makes sense, though, that the front diff be slightly taller than the rear for steering control.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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