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Was the 4.11 ratio available for 72 LT1



My 72 LT1 was 4.11 gears in it and I would like to know if this ratio was available or was it aftermarket?
The 4.11 ratio was an option (code AC) in 1972 and you could get it with the LT1 engine option.
Thanks,The corvette black book is a little vague. In one section it lists it as an option and under one of the photo's it implies that it was only available with the ZR1 option.

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