Conventional gearboxes generally have two sets of gears: input and output. the input & the output. The enter gears are mounted about the countershaft, making them single units. It drives the person gears on the main shaft, which rotate freely on the bearings. So by locking any one’s gear, https://gearbox82581.thenerdsblog.com/39565634/the-ultimate-guide-to-gearbox