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In the automotive industry, thin-walled chassis is widely used due to high strength and stiffness-to-weight ratio. For a vehicle, the functions of chassis are to carry loads, protect passengers and cars components. Since the chassis is the heaviest part for a vehicle, it must be designed with higher strength and stiffness-to-weight ratio to produce energy-efficient vehicle (EEV). For a chassis, its strength and stiffness greatly depend on the joint stiffness. In automotive production, chassis is formed by joining thin-walled beams using the welding technique. However, it will expose this chassis to buckling and joint flexibility effect that will reduce its strength and stiffness. In this research paper, the effect of vertical gusset plate to the stiffness of the thin-walled chassis will be carried out using the experimental method under bending and torsional loads. From these experiments, it is found that the bending stiffness increases by about 25.45% while torsional stiffness increases 84.75% when vertical gusset plates are introduced. From this study, it is proven that the vertical gusset plate is a good alternative to improve bending and torsional stiffnesses of thin-walled chassis.