One aftermarket replacement worm gear. Replaces part numbers 51405MA and 51405. Designed for 2stage snowblowers to restore auger drive and reliable snow clearing performance. Key benefits Restores power transfer from the gearbox to the auger, resolving slipping, loss of auger rotation, and reduced throwing performance. Direct replacement for the specified part numbers for a precise fit and dependable operation. Minimizes downtime by allowing a straightforward swapin replacement so equipment can be returned to service quickly. What it does Function: Acts as the worm gear in the snowblower drive system, transmitting torque and coordinating auger rotation for effective snow removal. Application: Intended for 2stage snowblower gearboxes where the original worm gear is worn, damaged, or stripped. Compatibility Replaces part number 51405MA and 51405. For use in 2stage snowblowers. Fits models listed as 536886540 Snowblower, 536886180 8 Hp Snowblower, and 536886110 22 inch Snowthrower. Performance and attributes Aftermarket replacement designed to meet fit and performance requirements for the listed models. Supplied as one worm gear to the worn or failed component and restore normal auger drive. Installation and maintenance Intended as a direct replacement part for the specified models. Basic mechanical skills and standard hand tools are typically sufficient for installation. Recommended as a item during routine preseason maintenance or when auger engagement problems appear. Typical use scenarios a stripped or worn worm gear after the auger slips and will not engage under load. Install as part of preseason maintenance to ensure reliable performance through the winter season. a snowthrower midseason when reduced throwing distance or unusual gearbox noise indicates gear wear. Includes One aftermarket replacement worm gear that replaces part number 51405MA / 51405 for the listed 2stage snowblower models.