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The guys at STaK 4x4 wanted more for their own Jeeps so they took apart a Dana 300 transfer case and figured out how to improve it. The Monster Box three-speed gears (right) dwarf the 300 gears (left). The STaK gears and shafts are made of 8620 steel that has been heat-treated and carburized. Carburization involves heating the gears and adding carbon to the exterior for greater longevity and strength.