The vibration and noise influencing factors affecting driving performance and ride comfort are examined from the viewpoint of veihcle operator. It is mecessary to consider the optimization in the design by converging the operational conditions of each existing vehicle and the new vhicle as different parts are designed. In tihs sutdy, we analyzed the influential factors to consider the new operator's position between the part and the customer according to the specifications given in the design specifications and the parts replacement in the existing vehicle.