It's the high speed that's the ring and pinion ratio, the low speed is a reduction done through a planetary gear set inside of the differential carrier.
You can change the ring and pinion gear set, and get a different set of ratios, but where are you going to find the parts for that at? All the ones I've seen had ratios in the 5 or 600's. Maybe you can cross gear sets from other axles to fit into a 2 speed. Maybe you can get something custom made?
Here is a thread where it was discussed a few years ago.
At the bottom of the page, elliot was told the same thing that I've learned and assumed. They didn't design 2 speed axles as an overdrive but as a crawler gear, which is why you won't find the right ratio's to make them into one.
We had 2 trucks where I work with 2 speed rear ends. Both were Chevrolet Kodiak’s. Low gear was indeed for pulling or “crawling”. Neither could be shifted while moving.
Someone else said this but was a good explanation of why to stay away from EGR engines. When it comes.to EGR, you can only breath your own sh*t for so long before problems occur.
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