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hi guys I know been a while since I last posted a general question, so I guess here's another I have. On 2004 buick rainier it has a 10bolt 8.6 3.73, I want to go with same 8.6 but with a 4.10 gear ratio. How can I tell difference between 8.6 vs 8.0 differential if anyone can chime on this topic it be so helpful.
 

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I don't believe the outside housing is different* - so you may have to use the service tag that's stamped into the housing* - somewhere*.

Get a short bristle wire brush - or a wire wheel on a drill (to keep it low speed) - and clean everywhere you think a tag might be.

I'd tend to look at the rear flanges, close to the actual housing for the differential*.

Other than that* - there's always the eyeball looking at it when it's apart*....

* - I could be wrong
 

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Ya know .... I don't think GM every got cheap on the differentials - 2wd or 4wd, the rear end was the same.
 
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