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Old 05-17-2008, 01:18 AM
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Ford 9" Rear End

I am going to be hopping up an old 66 Mustang and with the engine I plan on putting, a friend said he would definitely recommend a Ford 9" rear end. I wish I could agree but I am new to this kind of stuff. I know about engines and what-not but I honestly don't know much at all about the Ford 9" rear end. Could someone maybe direct me to a website that could enlighten me or share any information I could look into for 450+ HP?

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Old 05-17-2008, 01:48 AM
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Here's 1 link if your looking for donors to find a 9". Or do a search on this forum for 9" Info.
http://dfwmotorsport.com/Fairlane/9inchrearends.htm
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Old 05-17-2008, 08:53 AM
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heres are some brief instruction on to install gears in your axle.
http://www.ridgenet.net/~biesiade/gearinstal.html

and this is an OK overview of a cheap, but very slick, rear disk break set up. you can use junk yard parts where they buy new.
http://www.mustangandfords.com/howto...ion/index.html
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Old 05-17-2008, 09:24 AM
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I suggest this site ...

http://www.kevinstang.com/Ninecase.htm

As for the 9 inch VS 8 inch agruement ... remember that when Ford built the early Hi-Performance Mustangs with the better horsepower ... 271 HP / 289 ci ... Ford installed the 9 inch rear.

Whenever the horsepower went up ... in went the 9 inch.
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Old 05-17-2008, 05:06 PM
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I believe what you're asking is if you need a 9". With 450 HP, (although torque is what breaks things and would be a more relevant number) the short answer is yes. Your 8" could possibly be beefed up to take it in a light car like the Mustang, depending. But... the 9" would be more cost effective in the long run. 9" housings that will bolt in were used in '67 through '70 Mustangs that came with the larger engines. I'm not sure if the housings from '71 through '73 Mustangs got wider or remained the same. Also, '57 through '59 Ford 9" housings are actually 1" narrower than the Mustang ones and would go in with little problem.
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