Body shell The body shell is the assembly basis of all car body components. It generally refers to the rigid space formed by key load-bearing components such as longitudinal beams and supports, and the sheet metal parts that connect them to each other. layout. Most passenger car bodies have very obvious frames, while car bodies and truck cabs have obvious frames. The body shell generally also includes materials and coatings such as sound insulation and noise reduction, heat insulation, shockproof, anti-corrosion, sealing, etc. laid on it.