A subframe is seen in which type of vehicle?

• A. Body-on-Frame
• B. Space Frame
• C. Monocoque
• D. Unibody

Answer: (D)

Subframes are a feature of unibody designs. In unibody construction, the body and frame share the vehicle’s structural loads, and front (and sometimes rear) subframes are bolted to the main body to mount the engine, transmission, and suspension. These subframes provide a rigid mounting platform while the surrounding body structure handles crash energy and overall rigidity.

In a body-on-frame design, the separate ladder frame bears the main load, so a distinct subframe isn’t the defining structure. A space-frame relies on a lattice of tubes for the chassis rather than a conventional subframe, and in a monocoque the body shell itself carries most of the loads—with any subframes acting only as mounting points rather than the primary structure. So the presence of a subframe is most characteristic of unibody construction.