The main advantages of virtual testing approach using multi-body dynamics analysis include that the design can be evaluated and easily validated by subsequent physical testing before a prototype. It is hard to get accurate simulation results with full vehicle dynamics model on the rough road surfaces such as Belgian road and to get accurate components model such as tire, road profile, vehicle model. This paper describes the correlation method of full vehicle model using 4 post excitation tests and evaluates the sprung, unsprung mass response and each wheel force of selected vehicles to cyclical vertical accelerations over a range of frequencies.