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3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

are they 26 or 28 spline?

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Old Feb 25, 2003 | 10:49 AM
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GreaseMonkey83's Avatar
GreaseMonkey83
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From: Toledo, Ohio
are they 26 or 28 spline?
i am going to buy an 89rs for parts, does it have 28 or 26 spline axles? i need 28 spline for my 87 IROC. I heard gm switched to 28 in 1990, but ive also heard they changed in 1988. Thanks for help.
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Old Feb 25, 2003 | 11:02 AM
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From: charleston sc usa
let me know cuz i have a posi and it is 26 but i dont know what the spline is on my 87
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Old Feb 25, 2003 | 03:22 PM
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From: Mooresville, NC
1989 was the first year or the 28 splines. looks like your in luck. peace
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Old Feb 25, 2003 | 04:05 PM
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94z'sson
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From: charleston sc usa
thanks
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Old Feb 25, 2003 | 04:38 PM
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Stephen 87 IROC
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From: 51°N 114°W, 3500' elevation
The only way the 89 will have 28 spline is if it was late in the production year. Most of the 89's will have 26 spline.
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Old Feb 25, 2003 | 04:42 PM
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For 89 I think the only real way to know is to pull it out and count.
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Old Feb 27, 2003 | 09:25 AM
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If you have a BW 9-bolt rear you have 28 spline axle shafts.
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Old Feb 27, 2003 | 05:57 PM
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Fenster
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count those things... i thought my 89 would have the 28s but it has 26s... made the switch to the SLP takout posi a PITA
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Old Feb 27, 2003 | 08:42 PM
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Stephen 87 IROC's Avatar
Stephen 87 IROC
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From: 51°N 114°W, 3500' elevation
The BW 9 bolt 28 spline axles are totally different than the 10 bolt axles so you wouldn't be able to interchange them.

It's just good knowing that the BW diff is stronger in other ways.
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Old Feb 27, 2003 | 11:51 PM
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almost positive that the 9 bolts in the iroc are 30 spline.... mine were.
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Old Feb 28, 2003 | 09:42 PM
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87DJP2001
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All 9-bolt axle shafts were 28 spline, and if you have 30 splines they are not STOCK or you mis-counted.
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Old Mar 1, 2003 | 02:15 AM
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1SLOSBC
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From: P'COLA, FL
car has had several owners, it might have been upgraded at one point. dont matter, when i bought it i put a 9" in her.
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