Re: Questions on this 1969 Impala SS427 on eBay
As an example, when GM was going to build the COPO cars, they would have to build one or more prototypes to make sure that there wouldn't be any unforseen problems on the assembly line and that the setup would work satisfactorily on the street. This would be why the COPO cars got the BE and KQ rearends. Just a little more durability. GM probably knew that the standard 4.10 gears might be borderline especially with the extra power and when a 5-50 warranty is being applied. There would be emissions considerations as well. Never as simple as it first appears althought the COPO deal was about as simple as it gets.
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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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