2003 Mercury Grand Marquis Q&A

2003 Mercury Grand Marquis Question: I had a problem about a year ago with my rear shaft it leaked gear oil

now its doing the same thing when I drive and it go to change gears its make a sound of ramble (not sure how to discribe). and I want to know how do I add gear oil, my husband used to add it under the rear axel is this the correct spot -
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