Abstract: This paper deals with study of effect of varying thickness of front longitudinal member of pick-up vehicle in frontal crash. The objective is to study maximum force carrying capacity, energy Absorption and deceleration of seat member. The model chosen for study is well correlated and open source model. The physical test to FE correlation is well achieved and this model is suitable for further study about the crash behavior of frontal structure. The aim is to run this model with changes in thickness the longitudinal member of chassis structure which playing crucial role in frontal crash behavior.