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Urethane is utilized to bond the windshield and backlite to the vehicle frame. The contribution of different modulii of glass bonding urethane adhesives on the stiffness characteristics of the vehicle is studied through finite element analysis. The modal analyses of a finite element body-in-white model with different modulii of urethanes are performed, and the analyses show that high modulus urethane makes notable contribution to the vehicle stiffness. The optimized modulus of urethane adhesive is suggested based on the analyses.