The Lawn Boy 107-3860 Lawn Mower Transmission Assembly helps transfer power to the drive system for smooth and reliable mower movement. Designed as a replacement transmission assembly, it supports the mechanism responsible for moving compatible lawn mower equipment during operation. A properly functioning transmission helps maintain consistent drive performance and allows the mower to... https://www.wholetoolbox.com/lawn-boy-107-3860-lawn-mower-transmission-assembly/107-3860.html