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Rear diff not locking

Old Feb 15, 2014 | 06:27 PM
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Default Rear diff not locking

I have an 07 z51 6sp. I've always had an issue with the rear diff not locking so sometimes the two wheels spin seperate under WOT. Is this common? How can I fix?
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Old Feb 15, 2014 | 06:31 PM
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Have you changed the lube? If you use Red Line don't use the friction modifier unless you get chatter. If that doesn't fix it, the clutches may have an issue.
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Old Feb 15, 2014 | 11:36 PM
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Ok cool I'll try that. I've never changed the fluid and it has 47k miles....
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Old Feb 16, 2014 | 01:48 PM
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I have a lift and an oil drain tank in my garage if you want to come over.
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Old Feb 17, 2014 | 11:44 AM
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IIRC, there is a specified torque required to rotate one wheel while the other is blocked in place, with the car on a lift. If it takes less than specified to rotate the free wheel, then something is wrong. Might need only a fluid change, or clutch packs could be worn.

Unfortunately, I can't verify either the concept or the numbers, and don't have my Service Manual with me today.
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Old Feb 17, 2014 | 12:40 PM
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these cars have a limited slip, not a locking differential. odds are absolutely nothing is wrong.
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