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Quick help on gears 8.5 or 8.6

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Old 04-30-2008, 02:55 PM
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Default Quick help on gears 8.5 or 8.6

I am looking into gears will these work or are they F bod gears, I need the 8.6 ring gear??

http://cgi.ebay.com/ebaymotors/4-10-...spagenameZWDVW


Thanks John
Old 04-30-2008, 04:32 PM
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Hmmmmmmmmm.

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Old 04-30-2008, 04:51 PM
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8.5"s fit in there.... so do the 8.6"..
But the 8.6" wont fit in the older 8.5s

Haha.. you get it?
Old 04-30-2008, 05:02 PM
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Um ok so a 8.5 or 6 ring gear will work for sure, long as it isn't a pre 01 rear. What about the eaton posi units, they are going to be a 30 spline, I only see them for a 8.5..

John
Old 04-30-2008, 05:06 PM
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My mechanic couldn't get my first set of gears installed, we think they were for an 8.5 axle, I bought them 2nd hand and couldn't tell for sure. No issues when the 8.6s were installed
Old 05-01-2008, 11:27 PM
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i got a 99 silverado. what do i need? what size came in it?
Old 05-02-2008, 12:13 PM
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mine was 8.625, but i think 8.5 would have worked, thats why they sent me a shim kit in the install package
Old 05-02-2008, 12:51 PM
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um 8.5 and 8.625 gear sets are exactly the same. Now if you swapped differentials, it may have had the wrong bearings pressed in. The 8.5 and 8.625 bearings are different.
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