Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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What weight gear oil did you put in the rear?
That is only part of it. What is the exact weight oil used.. ?
Your truck requires 75w90 Synthetic gear oil. I would start with putting the correct fluid in it and see if that resolves your issue.
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When you do diff work, you have to make sure everything is shimmed properly and everything has the proper clearances. If something is a little off, it could make noise. So you may want to have the diff work rechecked if the noise is coming from the rear diff