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Thread: Ford 8" and 9" Diffs what horsepower will they handle ?
          
   
   

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  1. #1
    southerner's Avatar
    southerner is offline CHR Member/Contributor Visit my Photo Gallery
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    Jun 2004
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    Car Year, Make, Model: 69 Holden HT
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    Ford 8" and 9" Diffs what horsepower will they handle ?

     



    Been a lot of talk in different areas about how much horsepower these diffs will handle. The 8" is a lighter duty than the 9" but works well under a light and medium weight car. True ?

    The 9" seems to have a big difference in various setups like grey cast iron, nodular, open, positraction, locker. Then there are spline sizes like 28, 31, 35 and 40 spline with numerous different carrier bearing sizes. Where does a guy start ? And what kind of car/racing exactly demands "heavy duty" ?

    So everybody that runs them must have a different opinion of them.
    Last edited by southerner; 11-12-2006 at 10:25 PM.
    "aerodynamics are for people who cant build engines"

    Enzo Ferrari

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