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10 bolt posi question...

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Old 05-04-2008, 12:19 AM   #1
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Default 10 bolt posi question...

I have a 98 Formula with 2.73s. The posi isnt working and I want to go to a steeper gear. I found a 3.42 rear end for $50. But it has a bad spider gear. It is out of a 2000 ss.

What kind of posi do I have in my 98 Firebird? Does my 2.73 rear end have the same spider gears, or is it a different type of posi?

Thanks for the help.
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Old 05-04-2008, 10:08 PM   #2
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Ok, i am pretty sure my 98 has a auburn. So if the 3.42 rear end has spider gears, it has to be an auburn also.

Will spider gears out of a 2 series fit in a 3 series carrier?????
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Old 05-04-2008, 10:20 PM   #3
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I thought I've read before the newer cars had a different limited slip. I'm not too sure, you'll have to wait for a more knowledgeable person to chime in
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Old 05-04-2008, 10:33 PM   #4
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There are different...I found this out the other day when I removed the covers. 98 vs 99 and up.
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Old 05-04-2008, 10:37 PM   #5
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99+ is Eaton
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Old 05-05-2008, 04:52 PM   #6
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Quote:
Originally Posted by FirstLSx View Post
99+ is Eaton

Are you sure????
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Old 05-05-2008, 04:58 PM   #7
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This guy was selling an auburn rear out of a 2000 ss, so I dont think that is correct. I dont think any 98+ f bodys came with eaton stock.

FS: Rear End, 3.42's, Auburn, 3k mi

They are either auburn friction type, or torsen worm gear type.

Anyone else know...
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Old 05-05-2008, 05:08 PM   #8
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Quote:
Originally Posted by FirstLSx View Post
99+ is Eaton
No it's not.
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Old 05-05-2008, 05:22 PM   #9
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Quote:
Originally Posted by JGoodin86 View Post
This guy was selling an auburn rear out of a 2000 ss, so I dont think that is correct. I dont think any 98+ f bodys came with eaton stock.

FS: Rear End, 3.42's, Auburn, 3k mi

They are either auburn friction type, or torsen worm gear type.

Anyone else know...
You are correct. The SSes (and Firehawks as well, I believe) were offered from SLP with the option of an Auburn (Pro??) instead of the stock Torsen T2.
'99 and up, Torsen T2 stock.
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