@Hennes: In a manual parked in (low) gear, the motor is directly connected to the wheels, and so can hold the car quite well. but in an automatic in D, the motor is connected via the torque converter, which is not a mechanical link. So, the motor itself can not hold the car. To ensure you select 3rd from 2nd, as you push the lever up from 2nd into neutral, the gear levers natural position is to sit between 3rd and 4th, so by releasing your hand from the lever briefly when in neutral, the lever will sit directly between 3rd and 4th. Then simply push the lever up into 3rd..