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This paper describes a simulation method used for the study of light-duty truck vibration. Building block approach (BBA) combined with the finite element method (FEM) was applied to simulate efficiently the overall dynamic behavior of a vehicle system. The frequency response function computed agreed very well with experimentally measured data of the vehicle. As a case study, this paper also reports the analysis of truck cab vibration caused by elastic vibration of the frame, concluding that the method developed was well applicable and effective to design stage. In addition, dynamic optimization technique using frame FEM model was introduced. Its output suggests the optimum place thickness distribution for the frame to keep a certain target of natural frequency.