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I believe the front diff oil is changed with the transmission fluid which is a plug on the trans case and then filled from a hole on top of the trans in the engine bay. The rear diff should have two plugs on it. Top plug is the filler and bottom is the drain. Make sure you can get the filler plug open before you open the drain plug or else you're boned lol. I'm running 75w-90 in my car and many others are as well. Good luck with the diff fluid change, I tried to get the plugs off mine recently and they were welded on there practically so be prepared to muscle some plugs haha
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