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

are they 26 or 28 spline?

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Old 02-25-2003, 10:49 AM
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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 02-25-2003, 11:02 AM
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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 02-25-2003, 03:22 PM
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1989 was the first year or the 28 splines. looks like your in luck. peace
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Old 02-25-2003, 04:05 PM
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thanks
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Old 02-25-2003, 04:38 PM
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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 02-25-2003, 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 02-27-2003, 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 02-27-2003, 05:57 PM
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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 02-27-2003, 08:42 PM
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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 02-27-2003, 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 02-28-2003, 09:42 PM
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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 03-01-2003, 02:15 AM
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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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