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the doubler, or two transfer cases uses the range box from a np 203 with the chain portion removed, and a custom made plate bolted to the back, then a np 205 is coupled to the back of the plate. A np 203 has a 2.01:1 low range, and the np 205 has a 1.96:1. When both the the range box from the np 203, and the np 205 are in low range, you have essentially a 4:1 low range. This is better for rock crawling and so on.
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