IN THE EARLY DAYS OF 4×4S, TRANSfer cases tike the Spicer 18, Dana 300, and NP205 were the norm. These cases all feature iron cases and are gear-driven for incredibly strength, but as manufacturers searched for ways to make 4×4s quieter and more fuel efficient the NP231, NP241, and NP271 emerged. By contrast, these transfer cases use aluminum cases and are chain-driven with planetary gears of varying size (depending on the application).
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