'65 Formula S with "factory" 727 and 8 3/4?

Gib Warnick said

I thought the 1966 4 speeds were all 8 3/4. Factory had to deal with some many warranty repairs with earlier 7 1/4

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http://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1966/66_Dart0019.jpg
I have found it interesting that they don't mention the rear axle size in their descriptions and options. Even the Galen books don't mention which rear axle in the 66 models. You have to look at the exact ratios and decypher which rear end it was.