A housing containing a valve to regulate the airflow through the intake manifold. The throttle-body is usually located between the air cleaner and the intake plenum. Transaxle A drive setup in which the transmission gearbox, clutch, final drive, and differential are combined into a single unit connected directly to the driveshaft. It is used mostly in rear-engine cars. Track Front track is the distance between the center of the left front wheel and the center of the right front wheel when the vehicle is set to its normal ride height and wheel alignment specifications. Rear track is the distance between the center of the left rear wheel and the center of the right rear wheel. They are not always the same.