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Old 08-14-2006, 10:14 PM
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By all reports ... the HP Mustangs came with a 9 inch ...
Fomoco parts catalogs from back then do not show a ratio of more than 3.80 for the 8 inch series ...
Whenever the Horsepower got halfway serious ... Ford went to the 9 inch. Even in the Fairlanes, Comets, Cougars and Mustangs ... because of warranty concerns.
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