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This paper describes the development of a simulation methodology to predict body mount functional stiffness. The method provides some improvement over the one previously developed by Cheng and Le. Advantages of this method are 1) user's expertise is not a requirement, 2) elimination of trial-and-error runs for tuning the stiffness characteristics and 3) a predictive tool applicable prior to crash tests. Verification of the method is carried out by comparing the numerical results with those obtained from trial-and-error method and tests. The method leads to promising results in full vehicle crash simulations.