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The CNC-machined Klune-V Extreme Underdrive is a beautiful piece, good enough for your coffee table. Check out the five different mounting options on the input side of the unit. Klune offers two basic styles: the David model with 4:1 gearing made for rockcrawling, and the Goliath model with a 2.7:1 ratio for heavy-duty applications such as our mud-lovin’ truck.