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Is my rearend an 8.5" or 8.6"?

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Old 12-29-2008, 11:25 AM
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Default Is my rearend an 8.5" or 8.6"?
It's a 2000 sierra 1500 with the rear disk brakes. I was under the assumption is was 8.5, but Ron (Ron's maching service) tells me it's an 8.6" and according that the master install kit is slightly different than the 8.5 kit. Can someone confirm this?
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Old 12-29-2008, 11:25 AM
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It's an 8.6
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Old 12-29-2008, 11:28 AM
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Interesting.

Is there any strength difference between the 8.5 and 8.6?
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Old 12-29-2008, 11:37 AM
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Not sure, I know that some of the 8.5s are 28 spline, and the 8.6s are 30 spline. Or vice versa.
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Old 12-29-2008, 01:16 PM
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you can get a kit to make 8.5 install kits work but why? its an 8.6 fo sho
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Old 12-29-2008, 01:20 PM
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Well I guess I had ordered the incorrect kit (the one for the 8.5) and luckily Ron caught it and sent the right kit.
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Old 12-29-2008, 01:38 PM
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8.6 30 spline.. A 8.5 install kit won't work on 8.6 but a 8.6 kit will work on a 8.5 hmmmm I think thats how it is
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Old 12-29-2008, 11:11 PM
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89 and older was 28 spline.
90-99 8.5 was 30 spline
99+ 8.6 is 30 spline.

8.5/8.6 simply use slightly different bearings. The gears interchange.

peace
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