When the researchers studied the behaviors of a vehicle chassis and the suspension due to the irregular road and the different driving conditions. they met some challenger, which ensures the comfort of a ride and the contact the wheels with the road all the time especially at cornering at all conditions of the road to ensure the safety changed to rigid chassis presented in most researches. the flexible chassis is resolved and requested to make a more realistic case to make a more accurate image by using FEM. The vehicle chassis behaviors due to the road irregularity and the suspension are studied before. the Bernoulli beam is governed by a fourth differential equation. Results are generated for elastic models. The model gives us the results only at the ends and midpoints. On the other hand, the elastic model using FEM give the time histories at every node of the beam including its flexibility