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Drivetrain - 2011+ Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. Fifth generation and above...

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Old 05-31-2019, 07:54 PM   #1 (permalink)
Ted White
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Leaking/Seeping rear differential

I have a 2019 with 20,000 kms (12,500 miles) on the odometer. While doing a wheel rotation I noticed that the left hand back side of the rear differential was covered in black oily dirt.

I couldn't determine exactly where the leak or seepage was coming from, although it appeared to be maybe from the top left, looking from the back. I checked bolt tightness, all OK, so I washed the casing and will start monitoring it for resumption of seepage. No point in going to the dealer until I can be a bit more specific.

While I wait though, I thought I would ask who else has had this issue and what was the cause? Highly unlikely that mine is the only 2019 with the problem.

Thanks in advance.

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Last edited by OkDually; 06-03-2019 at 10:07 PM. Reason: prefix
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Old 06-03-2019, 10:05 PM   #2 (permalink)
Ted White
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Come on guys - I can hardly believe it. Four days with no comments. Am I REALLY the ONLY 2019 owner with a leaky rear diff ??? Maybe I have to start believing that it's a "one off".

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Old 06-04-2019, 07:29 AM   #3 (permalink)
G2GBY
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Quote:
Originally Posted by Ted White View Post
I have a 2019 with 20,000 kms (12,500 miles) on the odometer. While doing a wheel rotation I noticed that the left hand back side of the rear differential was covered in black oily dirt.
Your service department will most likely call that it's not a leak. GM long time ago has change there policy on moisture, they say it's not a leak. It's not a leak until it's a visible oil leak.
Long time ago I had moisture around my lower oil pan and they weren't going to fix it then but I told them if there moisture there's a leak.
They fixed it but I doubt they would now.
Take it in and be persistent and good luck and let us know how it turns out.
Also I highly doubt you will find someone else have this leak being so new of vehical.

Last edited by G2GBY; 06-04-2019 at 07:43 AM.
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Old 07-20-2019, 12:40 PM   #4 (permalink)
Busdriver47
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Have a 2019 leaking around where the plugs are pressed into the houseing. My dealer is starting the paper work to get it replaced. They say should know something by midweek
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Old 07-20-2019, 01:08 PM   #5 (permalink)
Ted White
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I've concluded that's exactly where my leaking is occurring. Please keep us posted on your progress Busdriver47 - there may be a widespread problem here.
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Last edited by Ted White; 07-20-2019 at 01:08 PM. Reason: Spelling correction
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Old 07-20-2019, 01:29 PM   #6 (permalink)
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10-4
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Old 07-30-2019, 08:49 PM   #7 (permalink)
Busdriver47
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Follow up on my rear diff leaking , got a call today from my service writer. GM is going to replace the entire rear diff assembly.
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Old 07-30-2019, 08:57 PM   #8 (permalink)
Ted White
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Thank you VERY MUCH for that information.
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Old Today, 09:32 PM   #9 (permalink)
Busdriver47
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Got a call today pick my truck tomorrow around noon, replaced the complete rear , brakes and all
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Old Today, 09:51 PM   #10 (permalink)
Ted White
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Thanks for the update. I'm heading out of town for a few weeks, but I'm planning to pursue the problem when I get back in late September.

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