There isn't a single "hidden" VIN location on a 1976 Ford F-100. The VIN is primarily located on the
dash, typically visible through the windshield. However, a secondary location might exist on the
driver's side door post (the vertical part of the door frame). It's less common to find a VIN stamped elsewhere, but it's possible it could be on the frame somewhere, though this is much less likely and difficult to find.
Because of the age and potential for damage or alteration, you may have to clean areas of the truck thoroughly to reveal the VIN if it's faded or obscured.
