Does the body need to be removed to repair frame damage?
Properly straightening a frame means reversing the damage that has occurred. The body and frame were joined when the damage occurred and should be repaired in the same manner. Removing the body or any structural components before straightening will normally make the process far more difficult. Body components would only be removed after the frame is straightened. Even if a frame is to be replaced, the best shops will basically pull the old frame into shape before separating the body and chassis.