The differential fluid appears to be coming out of the vent hose?

2007 DODGE DURANGO
250,000 MILES • 3.7L • 6 CYL • 2WD • AUTOMATIC
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CRAZYDOG72
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I didn’t feel any fluid when I stuck my little finger in there. What could be the cause of this and how do I fix it? I recently got the vehicle listed above and I don’t know much about it.
Jun 22, 2024 at 6:02 AM
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STRAILER
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Yep, this can happen when the differential overheats due to gear oil that needs to be replaced or there is a mechanical failure causing the problem, either way I would remove the rear diff cover to inspect the gears and fluid conditioner, (check the fluid for metal flakes). Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/differential-service

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Jun 23, 2024 at 11:29 AM
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CRAZYDOG72
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Okay, there is also a hum or something is vibrating when I let off the accelerator above 60+. Could it be the gears or the driveshaft?
Jun 23, 2024 at 11:56 AM
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STRAILER
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Yep, is the hum coming from the rear of the car? If so, it could be the rear end is having an issue. I would remove the rear cover to see what's going on. Also, you can remove the driveshaft to check the U joints.

Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://www.2carpros.com/articles/how-to-remove-a-drive-shaft

This guide can help as well:

https://www.2carpros.com/articles/how-u-joints-work

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Jun 24, 2024 at 8:51 AM
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CRAZYDOG72
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Yes it is.
Jun 24, 2024 at 4:47 PM
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STRAILER
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Yep, this can be an issue, please upload images or a shot video of the problem once you have done the work.
Jun 25, 2024 at 10:07 AM