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There is an upper filler plug and a bottom drain plug in each differential. R&I (Removal and Installation) the filler plug first then the drain plug until the differential completely empties out. Then reinstall the bottom drain plug and add 90W gear oil which usually comes in a squirt bottle so you can add it into the upper filler plug. You should fill it up until the level is right at the bottom of the threads of the filler hole.

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14y ago
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Q: How do you change the differential fluid on a Toyota 4Runner?
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