Also, find out the specifics in your state. In Oregon the title follows the FRAME or unibody of the vehicle. So even if a new cab is placed on a frame, it would be titled on the original frame VIN, not the cab VIN. You can find the last 5 digits of the VIN stamped on the top of the frame somewhere near the sending unit of the passenger side tank. It varies by the truck where it is specifically stamped but it will be in that general area, which makes it very hard to find when the truck is together.