Dell XPS 13 Ultrabook Review. Dell's XPS 13 Ultrabook starts at $999. So you have a MacBook Air, a man sitting next to me on a flight from New York to San Francisco says to me as he gestures at the laptop stuffed in my seat pocket.
In rear-wheel drive automobiles the central drive shaft (or prop shaft) engages the differential through a hypoid gear(ring and pinion). The ring gear is mounted on the carrier of the planetary chain that forms the differential. This hypoid gear is a bevel gear that changes the direction of the drive rotation.
Has the pinion gear below the centerline of the ring gear. Allows a lower driveshaft so that the tunnel in the floor of the vehicle can be smaller. Allows a larger and stronger drive pinion gear in which the gear teeth slide across the teeth of the ring gear. Makes the gears quieter. Requires special GL four or GL five lubricant