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The lower unit, also called the gearcase, is the bottom section of an outboard that sits partially underwater and connects the engine's power to the propeller. When the engine runs, power travels down the driveshaft into the lower unit. Inside the gearcase, gears redirect that rotation to the propshaft, which turns the propeller. In simple terms: Engine → Driveshaft → Gearcase → Propshaft → Propeller But transferring power isn't the lower unit's only job. What's Inside an Ou …