Abnormal noise outside the vehicle when shifting an automatic transmission can be caused by the following reasons: 1. Reason one: The release bearing lacks lubricant, leading to dry friction or bearing damage. 2. Reason two: There is no gap between the release bearing and the inner end of the release lever. 3. Reason three: The bushing and guide tube of the release bearing are contaminated with oil and dirt, or the return springs of the release bearing and pedal are fatigued, broken, or detached, resulting in poor return of the release bearing. Below is an introduction to automatic transmissions: 1. Introduction one: An automatic transmission is a transmission device that can automatically shift gears and operate based on the vehicle's speed and engine RPM. 2. Introduction two: There are currently four common types of automatic transmissions in vehicles, namely hydraulic automatic transmissions, mechanical continuously variable transmissions, electronically controlled mechanical automatic transmissions, and dual-clutch automatic transmissions. The core function of an automatic transmission is to achieve automatic gear shifting. 3. Introduction three: The so-called automatic gear shifting means that the driver operates the accelerator pedal according to driving needs while the vehicle is in motion, and the automatic transmission can automatically shift gears based on engine load and driving conditions.
