What causes severe shaking when a BMW is shifted into D gear?

[VanHaley]

The reasons for severe shaking when a BMW is shifted into D gear are as follows: Engine speed is too high: For example, when the engine speed is too high during cold start, the torque converter transmits more power, resulting in greater impact force when shifting gears and more noticeable shaking. Brake is not pressed firmly: Because the moment the gear is engaged, the engine power is directly transmitted to the wheels. If the brake is not pressed firmly at this time, it can cause slight movement of the wheels when shifting into D gear, making the vehicle suddenly move forward and increasing the shaking sensation. Brake is released too early: This is most common when waiting at a traffic light. After the light turns green, the gear is engaged and the brake is released to start moving, but the vehicle suddenly jerks forward when the brake is released. This is caused by releasing the brake too early, leading to an abrupt power engagement.