Transaxle

A Transaxle gearbox is one which has the differential built into it. These types of gearboxes are found in FWD vehicles.

The way it works:
The input shaft is connected to the flywheel, so as the flywheel spins so does the input shaft. On the input shaft there are driver gears. The lower the gear, the smaller the driver wheel is. Each driver gear links up with a driven gear on the output shaft and, conversely, the lower the gear, the bigger the driven gear.
These two shafts transfer the power into the differential which spins the axle.