Purpose <p>This paper presents the results of using the modal assurance criterion (MAC) method to analyze and compare the kinematic correlations of a referent frame structure and a designed frame structure. A basic structure of a light truck was employed to analyze the structural kinematics of chassis structures. The kinematic correlation of the frame structure was presented in three main modes of vibration: longitudinal bending, transverse bending, and longitudinal bending.</p> Methodology <p>The modal assurance criterion method was used to analyze and compare the modal shape of the structure, which means that when comparing the natural frequency of the structural system. It is necessary to combine it with the value from the modal assurance criterion comparison to determine the correlated modal shape pairs.</p> Results and Conclusion <p>The MAC value ranges from 0 to 1.0. The MAC value is 1.0, indicating a high correlation between modal shape vectors, while its value near 0 means that the modal shape vector is not correlated. According to the MAC analysis, six significant oscillation modes with MAC values are greater than 0.9. It was accepted for the degree of kinetic correlation.</p>