Re: VIN doesn't make sense!
Do a search or look in the FAQ section. There have been several posts on the subject. GMC is different. Here is a link I just grabbed to give you an idea.
http://67-72chevytrucks.com/vboard/s...c+vin+decoding
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1968 Chevy C/10 LWB V8 
1983 K5 Blazer
1989 C1500 Stepside Reg. Cab V8
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