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Old 01-06-2003, 06:58 PM
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Post 9" rear end or not

I am in the process of rebuilding a 66 mustang conv from the ground up. It has a 289 and a 8" rear-end. I plan to build a strong 289 (300 to 350 hp). Do I realy need a 9" rear end. If so here is my next question.

According to what I have read the rear-end in a 66 and older mustang is 52 inches wide. 67 and newer mustangs are 54 inches wide. Can I use a 67 or newer rear-end in my 66 or will the tires rub. I have 15 inch R60 tires.

If I cant use a newer mustang rear-end. What other rear-end would you recomend. From what I here a 66 and older 9" rear-end is hard to find.

Im new with mustangs so any advise would be helpful

Thanks in advance. Tommy L

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Old 01-06-2003, 07:30 PM
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If you can find it I would reccomend using a 9 inch... just me though
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Old 01-06-2003, 08:31 PM
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An 8 inch rear should be strong enough for your application.
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Old 01-06-2003, 10:01 PM
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ill cast a vote for your stock rearend being strong enough.
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Old 01-06-2003, 10:10 PM
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.


When Ford put the 271HP 289 in the Mustang..... Ford went to the 9 inch.

WHY ?

Ford believed it needed it.


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Old 01-06-2003, 10:29 PM
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You also have to look at if you are going to be putting more power to it in the future... if so do you want to change the rearend again?
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Old 01-07-2003, 11:40 AM
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I honestly don't believe you need it. The 271hp K-code mustang ran a 15.5 in the quarter mile, and thats with 4.11s. I was running consistent 14.5s with my 8 inch and 2.79s, and its NEVER been rebuilt or anything. I don't even know how many miles that thing has on it, i mean its 37 yeasr old. its got an axle bearing out, and I drove it to san fran without any problems. I think ford put a 9-inch in it just so it would be extra beefy for racing, kinda like they put big carburetors on some of their engines so they could be successful in stock racing clases where a stock size carburetor was needed. Did they really need it? No.
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Old 01-07-2003, 12:12 PM
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If your not planning on running the crap out of it the 8 in. will be plenty.I ran a lot of 289's with an 8 and never tore one out.It's already there what do you got to lose?
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Old 01-10-2003, 06:59 AM
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An 8 " rear end can be built strong enough to stay together behind 400 HP + .The longevity of this unit depends on your driving habits. If you aren't going to beat the thing to death at the track, it will stay together. Check out some of the Currie aftermarket beef up components for your 8 " unit. I am running a 302 est. 300 HP in my 65 Ranchero and so far so good. I am looking for another 8 " will I will narrow, stregthen and add a locker to. In the meantime, I am not having any problems.
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Old 01-10-2003, 07:37 AM
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Tommy, thier is a sweet little driveline shop in your own back yard, that might be worth you time looking into!!

Mark Willams Enterprise
Louisville, Colorado
765 South Pierce Avenue
303-665-6901
800-525-1963
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Old 01-10-2003, 07:50 AM
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I would go with the 8". Only precaution I would take is installing a set of traction bars to avoid wheel hop that tends to break differential snouts on these rear ends. Otherwise should work fine.
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Old 01-10-2003, 01:52 PM
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im willys on the tractionbars issue, it will really help your ride overall. and the 8 inch is plenty strong, provided its in ok condition that is. and a second opint in favour of the 8 inch is the lower unsprung weight

stay with the 8 inch...
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