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At least on the 80's trucks, there is a partial vin on the passenger side, on the top of the rail just rearward of the body mount under the front footwell.
In the 70's, prior to moving back further, I believe the partial VIN stamp on the frame is on the top of the rail next to the steering box.
On my '81 frame, the partial VIN is under the drivers seat area on top of the frame rail. I remember that specifically, as I watched the State Patrol inspector crawl under there with a dental mirror to check it.