The Valiant A-body platform utilized "unit-body" or "unibody" construction (not used by the Chrysler Corporation since the Airflow models of the 1930s) rather than "body-on-frame" construction. Instead of a bolted-in forestructure used in other unibody designs, the Valiant incorporated a welded-in front understructure and stressed front sheet metal. The fenders, quarter panels, floor and roof contributed to the stiffness of the body shell. A unit wheelbase comparison showed the Valiant to be 95% stiffer in torsion and 50% stiffer in beam than a 1959 Plymouth with separate body-on-frame construction. Dynamic testing showed that high structural resonant frequencies were attained, indicating greater damping and reduced body shake.