Mercury Upper Gear Set - 43-45814A5

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Mercury Upper Gear Set The upper gear assembly is a critical component in Mercury outboard motor systems, responsible for transferring power from the drive shaft to the propeller w ith precision and reliability. This OEM-quality gear set features hardened steel construction designed to withstand the demanding conditions of saltwater and freshwater marine environments. Engineered to exact specifications, it ensures smooth engagement and optimal performance across varying throttle conditions. Ideal for maintenance, repair, or performance upgrades on compatible Mercury outboard models. Proper installation maintains fuel efficiency and extends overall engine longevity. Show more