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rear end size

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Old Mar 28, 2008 | 06:58 PM
  #1  
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From: houston
Default rear end size
i have a 04 gmc sierra what size of rear end do i have somebody told me 8.6 and somebody else said 8.5 which one is it
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Old Mar 28, 2008 | 07:27 PM
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8.6 are you looking for gears or what?
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Old Mar 28, 2008 | 08:34 PM
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yeah im trying to get the 3.90 on ebay or summit but they all say 8.5

Originally Posted by gao8302
8.6 are you looking for gears or what?
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Old Mar 29, 2008 | 03:19 PM
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I thought the typical GM rear end size was 8.5?
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Old Mar 29, 2008 | 03:56 PM
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Originally Posted by sierraboy
yeah im trying to get the 3.90 on ebay or summit but they all say 8.5
I have heard the 8.5 gears will fit, you just need the 8.6 install kit.
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Old Mar 29, 2008 | 04:22 PM
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your rear end is an 8.6. 8.5 gears should work but 8.5 carriers will not work in the 8.6. 8.6 carriers will work in the 8.5 w/ conversion bearings.
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