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do I have to drain diff?

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How old is the oil? Might be time to replace it anyways.


I'm not sure. Which i believe is another way of saying "time to change it."

Can someone explain the friction modifier i need to add to the rear diff? Is there a gear oil that already has it added?


Whats the best grease to buy to put in the bearing caps and grease the u-joints after install. I am also doing the rear driveshaft.

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