The difference between unibody and body-on-frame vehicles is fairly straight forward. Unibody vehicles have the chassis and body of the car together. A body on frame vehicle has a frame which the vehicle stresses pass through, and the body of the car rests on top of this. Unibodies are more rigid due to the forces spreading over the entire vehicle, and because of this can also use less material and are lighter. This means better fuel economy, handling, acceleration and deceleration. Body on frame vehicles allow for better NVH, as the body can be isolated separately from the frame. They are also modular, allowing for various bodies to use the same frame.
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