If you were fortunate enough to have a "K" code 289 Hi-Po, Ford was nice enough to give you a 9" rear end in your classic mustang.
They also put 9" rear ends in the big block mustangs, such as a 68 428 CJ. However, for 90%+ of us, we get the 8" stock.
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http://www.comports.com/2bav8
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