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Old 01-17-2008, 11:21 PM   #1
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10 Bolt Limited Slip Rebuild...

Talked to a guy at Randy's ring and pinion today to order a set of 3.42's and a rebuild kit for the factory posi because I don't want to spend $500 on a beefy aftermarket posi for a 7.5. The guy asked what kind of posi came in the car. I don't know what to tell him. So what kind of posi comes in a 1987 Iroc Z with a 2 series carrier with 2.73 gears??? Has anyone ever rebuilt their factory posi in a 10 bolt that could provide some advice and confirm if its even possible??? Anybody know of anywhere else to get the rebuild kit??
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Old 01-18-2008, 06:57 AM   #2
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Re: 10 Bolt Limited Slip Rebuild...

It's an Auburn.

In theory, it's possible; but Auburn long since quit supplying ANY parts for those. You might be able to find some laying around somewhere in GM's parts system; but I seriously doubt it. I tried to get parts to repair about a 1997 one, in 2003 or 4; called Auburn direct, finally, when I couldn't find anything; they even had already discontinued those.
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Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
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Old 01-18-2008, 07:15 AM   #3
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Re: 10 Bolt Limited Slip Rebuild...

Does Auburn support their aftermarket ones any better?
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Old 01-18-2008, 08:14 AM   #4
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Re: 10 Bolt Limited Slip Rebuild...

Their most recent aftermarket ones, they have some kind of a program for; but it has to be pretty new to be eligible. Doesn't apply to the old stock ones though. www.auburngear.com/aftermarket
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Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
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Old 01-18-2008, 09:35 AM   #5
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Re: 10 Bolt Limited Slip Rebuild...

That's cool. $115 for an exchange, assuming mine is new enough to qualify.
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Old 01-18-2008, 10:10 AM   #6
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Re: 10 Bolt Limited Slip Rebuild...

Quote:
assuming mine is new enough to qualify
Right:

I actually went and looked at it and read the fine print.

http://www.auburngear.com/aftermarke...EX_Program.pdf

The unit itself has to have a production date less than 4 years old, or you have to have proof of purchase less than 4 years earlier.

4 years isn't of much value, to a part that is supposed to last for decades.

I will NEVER buy an Auburn product again, after the bad experiences I've had with them.
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Numquam ponenda est pluralitas sine necessitate.
William of Ockham, c. 1330 AD, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi

Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
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Old 01-18-2008, 10:21 AM   #7
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Re: 10 Bolt Limited Slip Rebuild...

I bought it used, so it is probably too old. Works well so far. Out of curiosity, when you had problems - did it just quit working correctly, or did it destroy other parts when it failed?
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Old 01-18-2008, 10:23 AM   #8
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Re: 10 Bolt Limited Slip Rebuild...

Key point to note:
you bought 3.42 gears to replace your existing 2.73 gears, and you want to rebuild (or reuse) your existing posi right?
You know how the 2/3 series thing works right?
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Old 01-18-2008, 10:46 AM   #9
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Re: 10 Bolt Limited Slip Rebuild...

If you're asking about mine, what it did was, the small end piece on the pass side that the bearing presses onto, came loose in the carrier; so the whole big piece, the main outer piece with the ring gear on it, could sort of flop around in the housing. Had a nasty vibe. Ruined a gear set. When I called them they basically told me I was SOL. I had bought it used, and it was maybe 7 years old at the time; so NOT ONLY was it ineligible for the "program", BUT ALSO they didn't have any parts for it any more and hadn't for several years. Basically, ZERO effort to stand behind their product. I bought an Eaton to replace it. Auburn can go pound sand for all I care, I'm not going back.
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Numquam ponenda est pluralitas sine necessitate.
William of Ockham, c. 1330 AD, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi

Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
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Old 01-18-2008, 11:30 AM   #10
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Re: 10 Bolt Limited Slip Rebuild...

My Auburn was working great too, then one big bang later it was dead.

I would second the Eaton.

Click the image to open in full size.

Click the image to open in full size.
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Old 01-20-2008, 11:24 AM   #11
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Re: 10 Bolt Limited Slip Rebuild...

Yeah, a "replacement program". What a joke! By the time you actually read all the fine print to that deal like Sofa did, it basically amounts to a pile of beans. Besides that, the program is really just a band-aid to supplement an inferior product design. Even Auburn units usually last longer than 4 years, so the replacement deal means nothing. At least if the clutches ever burn out in your Eaton unit, even if it's 20 years from now, you can buy the parts to rebuild it. Another thing to note is the picture that mcgee posted. Eaton's housings are made from high strength steel, and the spider gears are forged. A buddy of mine grenaded his factory Auburn unit exactly the same way as the picture above with a stock tpi motor.
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Old 01-21-2008, 11:28 PM   #12
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Re: 10 Bolt Limited Slip Rebuild...

Quote:
Originally Posted by Sonix View Post
Key point to note:
you bought 3.42 gears to replace your existing 2.73 gears, and you want to rebuild (or reuse) your existing posi right?
You know how the 2/3 series thing works right?
Yeah, 3.08 and higher (numerically lower) is 2 series and a 3.23 or lower (numerically higher) is a 3 series. Randy's Ring and Pinion sells thicker ring gears to compensate for the 2 series carrier. That way you don't have to run a spacer or change carriers.

I was just wanting to know if it could be rebuilt because I get sick of the weak springs in this posi. Is there a way to space the springs to make them clamp harder??? Turning to the right and nailing it...1 wheel peel. Turning to the left and nailing it...all over the road with 2 spinning. Nailing it from a stop going straight...its questionable, sometimes 1, but mostly 2.

Did any of the factory 7.5's come with an Eaton posi unit that isn't a Govlock???
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Old 01-22-2008, 06:45 AM   #13
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Re: 10 Bolt Limited Slip Rebuild...

Quote:
if it could be rebuilt
In theory, yes; in practice, no. There's no parts to do it with.
Quote:
Did any of the factory 7.5's come with an Eaton posi unit that isn't a Govlock???
No.
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Numquam ponenda est pluralitas sine necessitate.
William of Ockham, c. 1330 AD, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi

Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:

The simplest explanation that fits all the facts is probably the right one.
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Old 01-22-2008, 09:22 AM   #14
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Re: 10 Bolt Limited Slip Rebuild...

What if I were to just put gear lube only in the rear end with no additive would the unit function better as far as locking up just with a little chater around corners? Could that further ruin my posi unit? What about a posi unit from a 4th gen, the zexel torsen unit? Are they rebuildable? Will the carrier bolt up in a 3rd gen rear?
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Old 01-22-2008, 02:02 PM   #15
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Re: 10 Bolt Limited Slip Rebuild...

Zexels aren't rebuildable as they don't need to be rebuilt. Nothing wears out, no clutch packs inside it.
Yea, carrier bolts in, you just need matching 28 spline axles from a 1990-1992 third gen, or aftermarket. Boy this is a familiar topic to be discussing.... Check the other thread about this very topic that's on now. online170's thread
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Old 01-23-2008, 03:32 AM   #16
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Re: 10 Bolt Limited Slip Rebuild...

Yeah, if you can manage to pick up a torsen unit for a good price somewhere, that's definitely a good way to go. Like Sonix said, there's no clutches to wear out, they use gears just like the true-trac units. If it's not overly abused, a torsen should last indefinitely. If you still have an 87 rear, you'll need to hunt up a set of the 90-92, 28 spline axles too.
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Old 01-23-2008, 10:09 PM   #17
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Re: 10 Bolt Limited Slip Rebuild...

How good is the Detroit TrueTrac differential? I have heard of it, but does it take one wheel to spin before it engages, or does it do it real quickly?
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Old 01-26-2008, 01:19 PM   #18
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Re: 10 Bolt Limited Slip Rebuild...

Click the image to open in full size.

so my 3:08 is a 2 series carrier??
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Old 01-26-2008, 10:26 PM   #19
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Re: 10 Bolt Limited Slip Rebuild...

so my 3:08 is a 2 series carrier??[/quote]

Correct. 3.23 is the start of the 3 series carrier. Kinda screwy that the 3.08's are 2 series, but that's the way it is.
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Quote:
Originally Posted by WhiteIrocZ View Post
How good is the Detroit TrueTrac differential? I have heard of it, but does it take one wheel to spin before it engages, or does it do it real quickly?
You could send Sonix a PM and ask him. He just installed a True Trac in his car not long ago. I would imagine it engages quickly though. I know the Torsens do, and the True Tracs are a very similar design.
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Last edited by Pat Hall; 01-26-2008 at 10:29 PM. Reason: Automerged Doublepost
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Old 01-27-2008, 03:03 PM   #20
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Re: 10 Bolt Limited Slip Rebuild...

I just finished installing mine a few weekends ago, the rear end is still up on sawhorses and it'll be until april when the thaw hits before I get a chance to try it.
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Old 01-28-2008, 07:52 PM   #21
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Re: 10 Bolt Limited Slip Rebuild...

I also am look for a good way out, I have a 89 IROCZ with a 405 and a 700r4 trans. looking for a rear that will not brake. Don't know anything about rears (this is the third one in the car).
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Old 01-29-2008, 03:31 AM   #22
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Re: 10 Bolt Limited Slip Rebuild...

Quote:
Originally Posted by Bob Brown View Post
I also am look for a good way out, I have a 89 IROCZ with a 405 and a 700r4 trans. looking for a rear that will not brake. Don't know anything about rears (this is the third one in the car).
Wow, if you're already on your third replacement rear, it sounds like you're putting out enough power to justify spending the cash on an aftermarket 12 bolt or 9 inch from Moser Engineering. They cost about $2K-$2.5K, but they're a direct bolt in, and they're WAY stronger than the factory rears. Also, if you can dig up your own center section and gears, you can just buy the bare housing and axles for a bit less than $1K. When you consider the cost to keep replacing the weak factory rears, or to beef up one that still stands a real good chance of breaking anyways, the Moser rears are money well spent. Attempting to retrofit a different and stronger junkyard rear is more of a PITA than it's worth due to the difficulty of trying to adapt the factory torque arm to one.
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Old 09-04-2008, 01:36 AM   #23
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Re: 10 Bolt Limited Slip Rebuild...

Quote:
Originally Posted by WhiteIrocZ View Post
What if I were to just put gear lube only in the rear end with no additive would the unit function better as far as locking up just with a little chater around corners? Could that further ruin my posi unit? What about a posi unit from a 4th gen, the zexel torsen unit? Are they rebuildable? Will the carrier bolt up in a 3rd gen rear?

youll have bad wheel hop on turns if u dont add additive. yes itll hurt the posi, you could burn up the clutch packs, zexel arent rebuildable and will last a long time if you dont do any racing, and its just a daily driver
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Old 09-09-2008, 12:49 AM   #24
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Re: 10 Bolt Limited Slip Rebuild...

I upgraded to a True Trac unit with a 3.42 gear with a Trick Flow girdle and studs back in March. Great results so far, lots of hard launches at the track from a dig, dead hooking on ET streets making over 400 ft lbs to the tires.
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