When the automobile gearbox support is damaged, the following problems may be caused:

1. Unstable gearbox position: The main function of gearbox support is to support and fix the gearbox. When the support is damaged, the gearbox may be unstable, causing the gearbox to shake or swing, which will affect the normal operation of the gearbox.

2. Increase the vibration and noise of the gearbox: the damaged gearbox support can not effectively absorb the vibration and noise generated when the gearbox is running, which may lead to the increase of the internal and external noise of the vehicle and affect the driving comfort.

3. Intensify the wear and tear of gearbox parts: Damage to gearbox support will lead to additional vibration and impact on gearbox during driving, which will aggravate the wear and tear of gearbox parts and shorten the service life of gearbox.

4. Affect the smoothness of gear shifting: Damage to the gearbox support may lead to the instability of the gearbox position, thus affecting the normal work of the internal parts of the gearbox, making the gear shifting unsmooth and affecting the acceleration performance and fuel economy of the vehicle.

5. Increase the load of other components: the damaged gearbox support will make the gearbox unstable, which may make other adjacent components bear additional load and accelerate the wear and damage of other components.

Therefore, once the automobile gearbox support is found to be damaged or problematic, it should be repaired or replaced in time to ensure the normal operation of the gearbox and ensure the safety and reliability of the vehicle.