If you are behind the car facing towards the front. Look under the car. You will see the diff hanging down. At the bottom of the diff you will see the drain plug.
1. Loosen the drain plug with a 1/2 inch socket wrench and let the fluid drain.
2. Re install the drain plug with some rtv on the threads.
3. Loosen the fill plug on the side of the rear diff cover. It is about 2 inches higher than the drain plug.
4. fill the diff with 75/90 gear oil, using a hand pump which you can purchase at any auto parts store.
5. re install the fill plug and your good.
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