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A gear-driven transfer case, like the NP205, uses separate sets of gears to achieve the high- and low-range ratios. The NP205 is one of the most common old-school cast-iron cases, having been installed on 4x4s from each of the Big Three truck makers. They were used as recently as 1991 on GM trucks.
How Transfer Cases Work

 A gear-driven transfer case, like the NP205, uses separate sets of gears to achieve the high- and low-range ratios. The NP205 is one of the most common old-school cast-iron cases, having been installed on 4x4s from each of the Big Three truck makers. They were used as recently as 1991 on GM trucks.  View Related Article

 

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