| A friction material on the clutch disc. | |
| A suspension device made up of a flexible bladder containing compressed air. The airspring takes the place of a conventional coil or leaf spring. Air is supplied by onboard compressor, usually with auxiliary equipment two cents vehicle height modify the pressure in the air spring as needed. | |
| Crankshaft position sensor | |
| Enclosure for the differential and pinion gears. Can be removable are integral part of axle housing. Also called differential housing |