Hello, I'm Danny.
Here is the information you requested. The service manual shows that the rear differential gear oil is recommended to be changed at 150,000 miles. Here is a tutorial showing how to change differential gear oil:
https://www.2carpros.com/articles/differential-service
I've attached picture steps below on how to change the differential gear oil including the recommended type on your truck. Hope this helps an thanks for using 2CarPros.
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Saturday, May 15th, 2021 AT 2:37 AM