Re: 1968 Impala ss 427 question ? -
The axle code for 4.56:1 in 1968 would be DO. I don't know if there was a specific RPO code for the option. Here's a link to a great web site for 67-69 SS427 cars. You can get all kinds of info on those big cars from the site.
web page
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Mark
1966 L72, 4spd Caprice
1974 Z28, M40 Camaro
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