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There's a VIN decoder tool on this website. You can plug your VIN into it.
However, I believe '87 was the model year that things changed. Your '84 should be the same as an '80-'86. Lucky you that this time you got the Trim package.
Check the sticker on the door for the build date.
Anything after Sept. would be the next year.
My 81 Flare side was built 11 / 80 making it a 81 model year truck.
Dave ----