Which is a special rear end in that someone purposely ordered it that way. It was standard on Ram Air cars and available as a special order ratio on certain 350 HO and 400 & 400 HO cars. If you haven't already, I would order the PHS documents to be sure what you've got.
I checked Rocky Rotella's recent book but didn't find any rear gear breakouts.
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto
