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Posi Units for 9-Bolt rear end

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Old Feb 13, 2005 | 07:07 PM
  #1  
Boomhower25b's Avatar
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From: Abington, Massachusetts
Car: 1985 Chevy Camaro IROC-Z
Engine: ZZ3 350
Transmission: T-5
Posi Units for 9-Bolt rear end

Does anyone know where I can get a new posi unit for my 9-Bolt Borg-Warner rear end. I have looked on Eaton and Auburn websites and have found nothing. Anywhere you might know that I could get a part like this would really help.
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Old Feb 13, 2005 | 09:09 PM
  #2  
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From: Okinawa, Japan
Car: 1992 Camaro RS
Engine: 383 w/Holley Stealth Ram
Transmission: Pro-built 700R4
Axle/Gears: 3.73
9bolt.com quote from his web site(all new parts unless stated)

The package price for a new posi unit, new 3.73 gear set, install kit* and delivery is $895 (lower 48) - New series 3 posi unit is $475 delivered (L48) - New gear set 3.7x is $335 ($475 w/ install kit*) delivered (L48)

Look on ebay for used ones but i'd buy new if i were you. I just bought 3.73 gears and a 3 series carrier and install kit. hope this helps
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Old Feb 13, 2005 | 09:50 PM
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From: Abington, Massachusetts
Car: 1985 Chevy Camaro IROC-Z
Engine: ZZ3 350
Transmission: T-5
Thanks for the help but I got a few more questions now.

On that website, you can buy new posi brake cones. Would that make my posi unit like brand new? How hard is it to rebuild those posi units? Would it be worth my time or should I just buy a whole new one?
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Old Feb 13, 2005 | 11:46 PM
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From: Byhalia MS, just south of memphis
Car: 89 Firebird
Engine: 6.0 LS
Transmission: T-56
Axle/Gears: 3.70
im gonna try and E mail you this PDF on rebuilding the 9 bolt carrier.
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Old Feb 14, 2005 | 06:12 AM
  #5  
Boomhower25b's Avatar
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From: Abington, Massachusetts
Car: 1985 Chevy Camaro IROC-Z
Engine: ZZ3 350
Transmission: T-5
That article is great, that will be a lot of help if I decide to rebuild it. But I'm still unsure if I should rebuild it.
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Old Feb 14, 2005 | 10:12 PM
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From: Byhalia MS, just south of memphis
Car: 89 Firebird
Engine: 6.0 LS
Transmission: T-56
Axle/Gears: 3.70
glad ya got it. me and a friend built mine and once ya get inside its pretty simple mechanics.
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Old Feb 17, 2005 | 06:14 PM
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From: RogueValley, Oregon
Car: 84Z & Porsche
Engine: 427sbc - 471 - 850 Demon Claw
Transmission: Bowtie stage II TH700R4 - 10" 3000
Axle/Gears: 9 Bolt w/ 3:45's
9 bolt

What is the URL for the PDF on the 9bolt rebuild? I'm about to start to rebuild my cones and may need it... Thanks, Cocacolakidd.
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Old Feb 17, 2005 | 09:57 PM
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From: Byhalia MS, just south of memphis
Car: 89 Firebird
Engine: 6.0 LS
Transmission: T-56
Axle/Gears: 3.70
i'll drop it to ya in E mail as i cant figure out how to send it in a link form.
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Old Feb 18, 2005 | 12:38 AM
  #9  
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From: RogueValley, Oregon
Car: 84Z & Porsche
Engine: 427sbc - 471 - 850 Demon Claw
Transmission: Bowtie stage II TH700R4 - 10" 3000
Axle/Gears: 9 Bolt w/ 3:45's
9 bolt posi unit

I received the file...it is the answer to many questions...Many Thanks
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Old Feb 18, 2005 | 01:00 AM
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From: Byhalia MS, just south of memphis
Car: 89 Firebird
Engine: 6.0 LS
Transmission: T-56
Axle/Gears: 3.70
if anyone needs parts, contact miles thru his site at
WWW.9BOLT.COM or WWW.DIFFSOLUTIONS.COM . cant recall exactly but i think he is selling cones. i know he has ready to go carriers.
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Old Feb 18, 2005 | 02:30 AM
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From: Ohio
Car: 88' Iroc-Z
Engine: LQ9
Transmission: T-56
Axle/Gears: 3.42
could someone drop that to me also? I want to research it before i rip into it my email thanks!
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Old May 1, 2005 | 09:33 PM
  #12  
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From: Buckeye, AZ
Car: 1988 IROC
Engine: 350CI
Transmission: 700R4
Axle/Gears: 9 bolt 3:70
I have not been able to get a reply from 9bolt.com. Are they still in business?
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Old May 1, 2005 | 10:32 PM
  #13  
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From: RogueValley, Oregon
Car: 84Z & Porsche
Engine: 427sbc - 471 - 850 Demon Claw
Transmission: Bowtie stage II TH700R4 - 10" 3000
Axle/Gears: 9 Bolt w/ 3:45's
Miles is still there, but he is very hard to get ahold of sometimes. He does have most all of the parts, and service stuff for the 9Bolts. Sometimes you have to convince him you are serious about a purchase. I guess in the past to many wasted his time with idle promises, and because of the limited call for his parts, and services, he has the buisness as a second job only. If you are serious, and keep trying he will help you, and then be very reliable even after a sale.

- Ed -
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Old May 5, 2005 | 09:01 AM
  #14  
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From: Columbia, Missouri
Car: '87 Iroc-Z
Engine: 355cid Cam'd
Transmission: T5 Manual
Axle/Gears: Stock 9 Bolt
use the same as 10 bolt as long a 7.75 or 7.65 in. rear end
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Old May 5, 2005 | 10:03 AM
  #15  
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From: Nebraska
Car: '89 Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 9 bolt
use the same as 10 bolt as long a 7.75 or 7.65 in. rear end
What are you talking about?
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Old May 5, 2005 | 01:23 PM
  #16  
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From: Columbia, Missouri
Car: '87 Iroc-Z
Engine: 355cid Cam'd
Transmission: T5 Manual
Axle/Gears: Stock 9 Bolt
well if you look into any catalog to order gears you'll notice it says 10bolt 7.65/7.75
10-bolt is same a 9 bolt.
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Old May 5, 2005 | 06:18 PM
  #17  
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From: Byhalia MS, just south of memphis
Car: 89 Firebird
Engine: 6.0 LS
Transmission: T-56
Axle/Gears: 3.70
no a 9 bolt cannot use anything from a 10 bolt. a 10 bolt came in 7.5 and 7.625 measurements. a 9 bolt is 7.75. event the caliper mounting plates are different where they mount to the axle housing.
ebven the seals on the axles are diff. there is a right and left seal.
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Old May 5, 2005 | 09:49 PM
  #18  
Eightyninef's Avatar
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you can tighten the posi unit by shimming the cones.
I sell the shims to do it.
I have tightened mine, and it works great.
about 15 - 20 people on this board has brought shims from me, and I have never heard 1 negative comment.....

the article on how to do it is buried on this board somewhere.

Larry
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Old Jun 30, 2007 | 10:44 AM
  #19  
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Re: Posi Units for 9-Bolt rear end

I know that I am reviving an old thread and probably beating a dead horse, but can any one send me the info and / or pdf file mentioned above??


thanks
David


moodvette@***.net
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Old Jul 2, 2007 | 05:16 PM
  #20  
tlove's Avatar
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Car: 88 GTA - White
Engine: Was L98 - Now LS1 Powered
Transmission: 4L60E
Re: Posi Units for 9-Bolt rear end

Like moodvette, sure would like to get a copy of that file! If someone has it and can forward that would be great, tlove@catt.com
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