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Old 01-12-2008, 01:57 PM   #1
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26 vs. 28 spline axles

I ordered a 28 spline posi unit for my 1989 iroc by mistake instead of the 26 spline unit. The axles do need replacing also, so I was wondering if I can use 28 spline axles instead of the 26 spline? Is the number of splines the only difference? I would hate to have to try to return the posi unit, as it was purchased online. I would rather just buy the 28 spline axles if I can. I have tried to contact the company I purchased the posi unit from to find out about this numerous times, but they do not respond to my messages. Thanks in advance for any help you can provide.

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Old 01-12-2008, 02:24 PM   #2
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Re: 26 vs. 28 spline axles

As long as you have a 28 spline posi then yes you can install 28 spline axles.

Factory 28 spline axles can be found in 1990-1992 third gens only. Aftermarket axles from places like www.tomsdifferentials.com are around $125 each and will be much better than factory axles. Fourth gen axles are also 28 spline but they're also longer and won't fit into a third gen diff.

28 spline axles are a slightly larger diameter than 26 spline so they're stronger.
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Old 01-12-2008, 02:30 PM   #3
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Re: 26 vs. 28 spline axles

Thanks, that's what I was hoping.
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Old 01-12-2008, 04:36 PM   #4
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Re: 26 vs. 28 spline axles

http://store.summitracing.com/partde...SAG%2DEV10%2D4

Best ones I know of; plus, they come with bearings, seals, & lugs (no extra $50 of incidentals required)
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Old 01-12-2008, 04:36 PM
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