What does the term "body swing" refer to in vehicle fraud?

The term "body swing" in the context of vehicle fraud specifically refers to the practice of replacing the body of a vehicle with one from a stolen car. This illegal activity often involves taking the exterior shell of a stolen vehicle and placing it onto a legitimate vehicle's frame or chassis, which allows the fraudster to mask the true identity of the stolen car and misrepresent it as a legally obtained vehicle. This technique can be employed to make it more difficult for law enforcement to trace the vehicle to its original stolen status, effectively enabling the perpetrator to sell the vehicle as if it were legitimate.

The other options describe different forms of vehicle manipulation or repair but do not capture the essence of "body swing." Using parts from a damaged vehicle to fix another involves repairs rather than misrepresentation of identity. Upgrading internal components refers to performance enhancements without changing the identity of the vehicle. Switching engine parts between vehicles can be part of legitimate repairs or modifications but does not relate to changing the vehicle's outer body for deceptive purposes.