Left.2WD. Right.2WD. w/GT3. w/o GT3. A short axle part used for connecting a drive shaft to a differential or hub. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Wheel Bearing Dust Cap to it's mounting point. axle. SHAFT. Adjust. SPINDLE. TENSION FLANGE. Wheel Bearing Dust Cap.