Why does it make a clunking sound when shifting to D gear?

[ElizabethDella]

Introduction to the reasons for the clunking sound when shifting to D gear: 1. Shifting without stopping the car completely: When parking, you should first bring the car to a complete stop before shifting the gear lever from D gear to P gear. If you shift to P gear before the car is fully stopped, the P gear lock hook inside the transmission will hit the gear, producing a clunking sound. This operation can cause the lock hook to wear or even break, and in severe cases, it can lead to transmission failure. 2. Incorrect operation sequence when parking on a slope: For automatic transmission models, the P gear relies on the lock hook to engage the gear to keep the car stationary. When parking on a slope, you should first apply the handbrake and then shift to P gear, allowing the handbrake to bear the vehicle's sliding force. If you shift to P gear first and then apply the handbrake, the sliding force will be entirely borne by the P gear lock hook, causing tension between the lock hook and the gear. This will result in a noise when shifting from P gear to other gears. 3. Malfunction in the gearshift mechanism: Many automatic transmission models with gear levers actually use mechanical structures to shift gears. Over time or due to corrosion, the connecting parts of the gearshift mechanism can become loose or stuck, leading to noise when shifting gears. 4. Wear and tear on transmission gears: The transmission is a precision component, and the gears are the most critical part. The meshing of transmission gears is extremely tight, leaving no room for any gaps. However, because of this tight meshing, wear and tear are inevitable. Over time, significant gaps can develop between the gear teeth, resulting in noise when shifting gears.