Standard gearboxes normally have two sets of gears: input and output. the input & the output. The input gears are preset on the countershaft, generating them single models. It drives the individual gears on the primary shaft, which rotate freely around the bearings. Spur and helical gears are Utilized https://gearbox59135.blogocial.com/not-known-details-about-gearbox-69565066