Typical gearboxes usually have two sets of gears: input and output. the enter & the output. The enter gears are set to the countershaft, generating them one units. It drives the person gears on the main shaft, which rotate freely on the bearings. Torque converter does exactly the same https://knoxwfmtx.blogtov.com/14291485/the-best-side-of-gearbox