Pull up the leather boot from the console for E30 models. Disconnect the shift knob illumination harness, if equipped. The shift knob either unscrews from the shaft or pull off. Install in reverse order and align the knob. For E36 models, block the wheels and set the parking brake. Place the transmission in neutral with the engine OFF. Grasp the gear shift lever and pull upwards sharply. It may take several attempts to release the knob. To install, align the knob on the shift shaft and rap the top of the knob downward sharply until It is fully seated.