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There are 2 plugs, just like on the tranny. The drain plug underneath and a fill plug 1/4 of the way up around, same height and side as the tranny fill plug. It's a bit hard to find and farther back on the differential than one would expect. Its actually as far back as the drain plug, so just follow a line up around the diff from your drain plug and you should run into the fill plug.
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