1, the backlash will affect the traction and bearing capacity of the vehicle, thus affecting the driving performance of the vehicle, increasing fuel consumption, and may lead to the vehicle losing control or changing the driving direction.

2. With the increase of the tooth clearance of the rear axle, the transmission system of the rear axle may be dispersed or displaced, which may lead to the failure of the transmission system and the vehicle may not be able to run.

3. The gap between teeth increases, which may also lead to wheel deviation, vehicle vibration, increased parts wear and tear, reduced vehicle service life, and may eventually lead to vehicle failure.