Conventional gearboxes typically have two sets of gears: enter and output. the input & the output. The input gears are mounted on the countershaft, generating them solitary units. It drives the individual gears on the main shaft, which rotate freely within the bearings. Torque converter does a similar function https://gearbox42963.bloguetechno.com/the-ultimate-guide-to-gearbox-68915099