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What is the Difference Between Body-on-Frame and Unibody?

1 Answers

LeLila

07/30/25 12:07am

The following are the specific differences between body-on-frame and unibody: 1. Structure: In body-on-frame vehicles, the bottom consists of an independent large steel frame or chassis beam. Components such as the engine and transmission system are mounted on this frame and connected to the front and rear parts of the vehicle via the front and rear suspensions. Unibody vehicles do not have a rigid frame at the bottom, but the front, rear, and side sections of the body are reinforced. The engine, front and rear suspensions, and transmission components are fixed in their designated positions and connected to the wheels via the suspensions. 2. Applicable vehicle types: Body-on-frame structures are relatively heavy, with high mass and a high center of gravity, making them suitable for trucks, buses, and off-road vehicles. However, due to their excellent stability and off-road performance, they are also used in some high-end vehicles. Unibody structures, known for their lighter weight and lower height, are primarily used in urban-oriented family cars and city SUVs.

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