th400 trans id code

i have a th400 i want to find out what year it is. it has the lock-up converter, witch i dont pan to use, so i know its a 80's modle. please help the code is c9b 159295 snipped-for-privacy@webtv.net

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Doesn't the C9B mean Chevy '79 from Baltimore plant or something like that? Then the 159295 is the production number?
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-Geno
1985 Blue Camaro 2.8L w/T-tops (147k and going.. getting worried though)
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