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4th Gen Posi Carrier..

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Old 10-02-2004, 05:50 PM
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Car: 1990 Iroc-Z
(quick quesiton) 4th Gen Posi Carrier..

...should swap right in to my 90 Iroc rear end...right?


28 spline..

Last edited by prOject-IrOc; 10-02-2004 at 06:10 PM.
Old 10-02-2004, 06:53 PM
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Depends on what gears you have, I believe.
Old 10-02-2004, 07:01 PM
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i will be puttin 3.73's in the carrier. my car has 3.42 posi now.
Old 10-02-2004, 07:36 PM
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Well, as long as the posi unit is a 3-series carrier, it will work just fine.
Old 10-03-2004, 08:51 AM
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Just make sure that IROC doesnt have a 9 bolt. Its a totally diffrent animal then the 10 bolt. If your car is factory with the L98, then I am 99.9% sure you have a 9 bolt.
Old 10-04-2004, 04:48 AM
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9 bolts were during the 86 - 89 thirdgens, 90 - 92 were 10 bolts with 28 spline axles.

https://www.thirdgen.org/newdesign/tech/techdb.shtml
Old 10-04-2004, 07:36 AM
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Originally posted by MdFormula350
9 bolts were during the 86 - 89 thirdgens, 90 - 92 were 10 bolts with 28 spline axles.

https://www.thirdgen.org/newdesign/tech/techdb.shtml
thank you very much. so the 4th gen posi unit should bolt right in...correct?
Old 10-04-2004, 05:32 PM
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Originally posted by prOject-IrOc
thank you very much. so the 4th gen posi unit should bolt right in...correct?

bump. i need to know for certain.
Old 10-04-2004, 07:34 PM
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If you have a 10 bolt with 28 spline axles, and you have the right series carrier to match the posi unit, then yes it will be a direct bolt in.
Old 10-05-2004, 09:49 PM
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i bought it.

:lala:

http://cgi.ebay.com/ebaymotors/ws/eB...tem=7925600846
Old 10-08-2004, 10:50 PM
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9 bolts were during the 86 - 89 thirdgens, 90 - 92 were 10 bolts with 28 spline axles.
On the contrary, the IROCS, except for the most base model version, have a BW 9 bolt. Easiest way to find out is to look.
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