41100-ZW5-710ZA Gear NH282MU Case - Overview. The 41100-ZW5-710ZA Gear NH282MU Case is a vital component within Honda marine engine systems, specifically designed for the lower unit gear assembly. This gear case houses and protects the internal gears that transfer power from the engine to the propeller, ensuring smooth and efficient propulsion. Engineered to integrate seamlessly with existing parts, it maintains optimal performance and durability under demanding marine conditions.. Key Features.