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The only known place beside in cab that I know is located on the upper portion of the frame on the front passenger side just behind the radiator support; if I can recall right.
hope this helps.
Been awhile since I look at mine.
Mitch
The VIN is actually stamped twice in the top of the passenger side frame rail, once just ahead of where the front axle crosses under and again under the cab.
I have one that I can barely read that is exposed, can't see the F1 at all, but it is there.
Hey Dave, Can you tell where it would be on a 66 LB Caus I need to find it before I go to get a dismantilers title for the parts truck. I need to make sure the frame is the same as Cab and my title. Thank's