The Jeep Technical frame pages are all about frames for Jeep vehicles. Jeeps used regular channel frames, boxed frames, and tube frames. Later Jeeps use a frameless uni-body construction in the XJ, ZJ, and WJ. Your frame might not be up to the task of hard use, especially if it is old. Frame boxing and gusseting can prevent frame cracks. Skid plates and cross members are also covered in the frame section.