Re: copo axle codes
If the 4.10-1 and 4.56-1 rearends were coded the same then the assembly line people would not know which rear end they were installing. Each rear end combination gets its own ID. As an example our COPO Chevelle has the KQ 4:10 axle assembly while our 396 car has the KK 4:10 rear.
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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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