It is probably silicone RTV holding it on. put a thin thing like a strong putty knife where arrow is in picture to break it loose then pull it off or put a couple of bolts in top then loosen bottom so fluid will drain. This video shows the job being done on a similar car but the process is the same.
https://youtu.be/ygti8zvpg4M
Here is a 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
Check out the diagrams (Below). Please let us know what happens.
Image (Click to make bigger)
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Sunday, November 6th, 2016 AT 12:09 PM