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Shift feeling is one of the most important factors in developing a manual transmission. When drivers operate a manual transmission vehicle, they experience shift feeling which is classified into several factors such as shift smoothness, clarity, comfortability, sportiness, and so on. In the factors, shift smoothness characterized by double bump force is regarded as one of the most important things in experiencing shift feeling in Europe. The double bump force is reduced by attaching a constant mass damper which creates larger inertia of shift lever in control system of manual transmissions. However, it is possible to have side effects such as vibration of shift lever and clonk noise when employing the constant mass damper. In this research, a new control system with a variable inertia mechanism is designed and investigated to improve shift feeling while minimizing the side effects.