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Unread 10-27-2008, 01:28 PM   #1
Cbaughn
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Help With Ford 9", or Ford 8.8

Hey guys, I have three Early Ford Broncos with the short 9" rear ends, and I was wondering just how easily these rear ends will bolt in. I know they have drum brakes, but I'm sure I can find a conversion kit for a reasonable price, or do something myself. I also have a cousin who owns a massive salvage yard, so I have access to a plethora of Ford 8.8 rear ends. I was just wanting feedback on whether the Ford 9" is substantially stronger over the 8.8, or if I should just go with a 8.8 and save myself some headache if there is anymore involved with installing a 9" over a 8.8. Also, is the bolt pattern the same? I can't get home to measure it for a while. Thanks so much guys and any feedback is welcome.

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Unread 10-27-2008, 01:33 PM   #2
KennyTJ
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9" is awsome strong with 33 or 35 spline axles. Not sure if the bronco came with more than 30 spline though. Not sure about the bolt patern but it's either 5on5.5 or 5on4.5. It's worth looking into.
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Unread 10-27-2008, 01:34 PM   #3
MLJeeper
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The swap in is as simple as doing the 8.8 swap. You can use the same bracket kits they sell for the 8.8. The early bronco axles are a bit shorter than even the 8.8 axles. The lug pattern will be 5 on 5.5 but can be converted with a set of spacers that make the width just right. As for strength, after market and the plethora of second hand parts, the 9" gets the nod. Go with the big bearing housing. If its not 31 spline thats easy to remedy but getting shafts for 31 spline with the small bearing is pretty much impossible. Even on the custom front.

Depending on your goals, 28 spline is still not a bad upgrade but make sure you have the option to upgrade to 31 splines etc by going with the big bearing housing. Course you can weld big bearing ends on the housing. Ahh the 9" ford, endless possibilities.
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Any video of the sound?

Last edited by MLJeeper; 10-27-2008 at 01:45 PM..
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Unread 10-27-2008, 01:51 PM   #4
Cbaughn
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Ha, that is awesome to hear then. I will probably beef her up pretty nicely and throw it in. I like the idea of using a spacer with a different bolt pattern to get back my width and use my wheels. I think it is 5x5.5 on the Broncos rear. I have a 4" rough country on it now, and if I spring-over the rear and put back on the stock leaf springs will the back match the front as far as heighth? I just think it would be easier to just do the back if it would sit right and do the front at a later date maybe. Any feedback is very welcome.
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Unread 10-27-2008, 02:18 PM   #5
MLJeeper
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I upgraded my dif when i went with more lift. My rig sits level with the early bronco axle in it SUA. NOt sure with your proposed config.

I wouldn't say i like the idea of running the spacers, but they've certainly caused me no issues and i beat my rig hard. When you go to install, you will either have to grind down the wheel studs to clear the spacers or get shorter studs. I will try to find the napa part number for the shorter studs.
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Your limited slip differential sucks.

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Originally Posted by Anticanman View Post
Any video of the sound?
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Unread 10-27-2008, 02:22 PM   #6
Cbaughn
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I was just wondering if with a 4" Rough Country in the front and stock springs spring over in the rear if the rig would sit level. And the ideas of spacers don't bother me, and I would very much appreciate that part number.
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Unread 10-29-2008, 12:37 PM   #7
Cbaughn
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Anybody know if she would sit level with that configuration? 4" Rough Country springs in the front and Spring-Over in the rear?
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Unread 10-29-2008, 12:45 PM   #8
sbenja2003
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Ive heard that a soa with stock springs = 5.5 of lift so it would probably sit higher in the back.
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Unread 10-29-2008, 01:15 PM   #9
Mobile_Homie
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Quote:
Originally Posted by MLJeeper View Post
The swap in is as simple as doing the 8.8 swap. You can use the same bracket kits they sell for the 8.8. The early bronco axles are a bit shorter than even the 8.8 axles. The lug pattern will be 5 on 5.5 but can be converted with a set of spacers that make the width just right. As for strength, after market and the plethora of second hand parts, the 9" gets the nod. Go with the big bearing housing. If its not 31 spline thats easy to remedy but getting shafts for 31 spline with the small bearing is pretty much impossible. Even on the custom front.

Depending on your goals, 28 spline is still not a bad upgrade but make sure you have the option to upgrade to 31 splines etc by going with the big bearing housing. Course you can weld big bearing ends on the housing. Ahh the 9" ford, endless possibilities.
Ford 9" in this car
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Unread 10-29-2008, 01:27 PM   #10
rescueyj
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What is the benifit of just springing over the rear
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Unread 10-29-2008, 05:39 PM   #11
Cbaughn
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That way I just have it done, and when i decide to do the front, I will just have to do that. And isn't the axle is already spring-over, I just don't know if the perches are the correct width apart. You feel me? Ha.
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