How to Decode the vin Help

[Speedtrapp30]

Ok I am not doing something right trying to find a place to decode vin on the Chief.

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http://www.grandwagoneers.com/images/GW%20Vehicle%20ID%20Plate.jpg

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Thanks to TonkaJ200 for the pic above.:thumbsup:

[Speedtrapp30]

What about before 1981? And mine doesn't have 17 numbers only has 13.