Hello, I am Danny.
If you were to crawl underneath and look at the differential you will usually find a rubber hose the goes from the differential and mounts higher up and fastened to the body. It will have a one-way at the end that lets vapors escape but will not let anything in. I looked for a picture but could not find one. Hope this helps and feel free to ask any questions if needed. Thanks for using 2CarPros.
Danny-
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Monday, September 17th, 2018 AT 3:00 PM