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well, at least my '71 Sportroof did. I'm sure 302 cars did, and I seem to recall 6 cyl cars did as well after a certain date, but uncertain what the particulars are on them.
 

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Most all Machs I have seen have 9 inch rears..didn't seem to matter what engine was in them
 

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Here is some useful info on 9" rears:

1. 9" rears were only on 5% of the 64-73 Mustangs.
2. Unless special ordered, 9" rears were only found with performance type motors.

This list is probably not 100% accurate but close, 9" equiped Mustangs included:
64-66; K code 289
67; K code 289, 390
68-70; 390, Boss 302, 351W 4V, 351C 4V, 428CJ, Boss 429
71-73; all 351C, Boss 351, 429CJ
 
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