what gears produce the final drive ratio
In almost all cases the pinion and ring gear will have helical cut teeth just like the rest of the transmission/transaxle. The pinion gear will be smaller and have a much lower tooth count than the ring gear. This produces the final drive ratio. The ring gear will drive the differential. (Differential operation will be explained in the differential section of this article) Rotational torque is delivered to the front wheels through CV shafts.