31246-ZW5-003 Gear Shaft Assembly - Overview. The 31246-ZW5-003 Gear Shaft Assembly is a genuine Honda marine engine component vital to the transmission system. It supports the gear shifting mechanism of the marine engine, enabling efficient transfer of power and propulsion. Engineered to precise factory specifications, this gear shaft assembly fits seamlessly with related hardware, maintaining the expected durability and performance standards Honda is known for. As a key part of the marine tran