9 Inch Open Rear...can it become a posi? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-19-2006, 07:37 PM
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9 Inch Open Rear...can it become a posi?

I recently bought a street rod with a 9 Inch for rear... its all painted up and pretty, but unfortunately its an open differential without posi (or whatever non-Chevy guys call it) Can a posi carrier be bolted into this rear without a major hassle? Do all the axles, etc. still work? Can I use the same 3.00 gearset? And lastly, where's a good source for rebuilt posi units? I'm not too experienced with Ford rears, but am hoping its an easy change to make... pegleg burnouts aint cool.

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Old 11-19-2006, 08:33 PM
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Sticking a posi unit in a Ford 9" is a piece of cake. Can't help you with used or rebuilt units but new ones are readily available from Summit or Jegs and several others.

A quick search of Summit's catalog came up with this one.

http://store.summitracing.com/partde...5&autoview=sku
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Old 11-19-2006, 08:34 PM
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Putting a limited slip carrier in a 9" is a relatively easy undertaking. You can buy a third member already set up or you can just put your ring gear on a different carrier. You will need to match the carrier to the axles, as in 28 or 31 spline. 31 spline trac-loc carriers are much easier to come by than 28's.
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Old 11-21-2006, 08:54 AM
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Or you can buy a Powertrax locker that will bolt into what you already have. Either way on the 9", the carrier will need to come out, which will involve some specific knowledge and possibly some expensive tools for resetting it...

Russ
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Old 12-01-2006, 11:27 AM
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On the street stick with any of the limited slip differetials, avoid any lockers.
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Old 12-01-2006, 11:33 AM
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The Powertrax unit is not your typical locker. It is very servicable for street use.

Vince
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Old 12-02-2006, 01:10 PM
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Quote:
Originally Posted by 302/Z28
The Powertrax unit is not your typical locker. It is very servicable for street use.

Vince
That is debatable, of course.

Lot's of people.... ahem.... have pushed the front end off the road when turning in the rain, etc.... even on a highway curve you have to get off the gas ....or else.... no steady power allowed in a turn or it won't unlock.

JMO
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