41100-ZZ3-020ZC Gear Nhb14M Case - Overview. The 41100-ZZ3-020ZC Gear Nhb14M Case is a critical component within Honda marine engine systems. This main gearbox assembly supports the marine propulsion system by housing the gears that transmit power from the engine to the propeller, ensuring reliable boat operation. Engineered to match factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. A genuine OEM gearbox as