lol i tried that too, even though i also have a GMC.
it said i had a 1960 model 3/4 ton. lol
for GMC vin decoders, try GMC pauls and the one on this site, i think using both together can help you crack the GMC vin.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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