What Happens If You Overfill Automatic Transmission Fluid?

[RyleeLee]

The hazards of overfilling automatic transmission fluid include the following: 1. If the transmission fluid level is too high, rotating components may come into contact with the fluid during operation. Under the high-speed rotation of planetary gear mechanisms or clutters, this can cause the fluid to expand and boil, leading to leakage from the fill port and vent valve. 2. Excessive air entering the fluid can also cause airlocks in the drain holes of the control valve body, resulting in poor drainage and causing gear shift shocks. 3. An excessively high automatic transmission fluid level allows rotating components to agitate the fluid, generating bubbles. When this aerated fluid enters the oil pump, the pump cannot establish the required oil pressure, leading to excessively low working pressure.