Abnormal Noise When Shifting Gears in Automatic Transmission?

[VonLukas]

Abnormal noise when shifting gears in an automatic transmission is generally caused by the following reasons: 1. The vehicle was not completely stopped before shifting. When parking, the vehicle should be brought to a complete stop before shifting the gear lever from D (Drive) to P (Park). If the vehicle is shifted to P before it is fully stopped, the P gear lock hook inside the transmission will strike the gear, producing a clunking sound. This operation can cause wear or even breakage of the lock hook, and in severe cases, may lead to transmission failure. 2. Incorrect operation sequence when parking on a slope. For automatic transmission vehicles, the P gear relies on the lock hook engaging the gear to keep the vehicle stationary. When parking on a slope, the handbrake should be engaged first before shifting to P, allowing the handbrake to bear the vehicle's sliding force. If P is engaged before the handbrake, the entire sliding force of the vehicle will be borne by the P gear lock hook, putting tension on the lock hook and gear. In this case, shifting from P to other gears will produce a noise.