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Here’s the inside of a BorgWarner 13-45 chain-driven case, the kind found on ’80s F-series pickups and second-generation Broncos. It has a 2.74:1 low-range ratio, achieved via a planetary gearset (the diamond-shaped gear near the clutch fork) that rotates inside an annulus gear (next to the planetary).
How Transfer Cases Work

 Here’s the inside of a BorgWarner 13-45 chain-driven case, the kind found on ’80s F-series pickups and second-generation Broncos. It has a 2.74:1 low-range ratio, achieved via a planetary gearset (the diamond-shaped gear near the clutch fork) that rotates inside an annulus gear (next to the planetary).  View Related Article

 

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