I just picked up this truck and don't know the year. the VIN is 3C154A125XXX. Tried vin decoder search didn't find what I needed.
Thanks

Based on your VIN of 3C154A125XXX, you have a 1963, Chevy C10 (1/2 ton), long bed (127" wheel base) pickup, built in Atlanta, GA and it was the 25,XXXth unit built.

I hope this helps.

This is a good, quick reference VIN decoder.