Re: 12 bolt axle codes??
In the Chevelles, GM had two different 4:10 coded rearends. Our L78 car has the KK unit while the COPO car has the MQ piece. The same would apply to the Camaros. My parts books list the MQ rearend but doesn't show any special parts in the parts listing. An original '69 parts book might be a better source. My book is a 1981 reprint.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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