Just fill it through the filler hole in the tranny. If your going to be under there to drain it the fill hole is right there... all you need is an $8.00 fluid pump to fill it up and you can see when it starts to over flow and come out of the hole, you can't do that filling it by the shifter. Plus to chang your gear/lsd oil you will need the pump anyways! Just remember to always loosen the filler hole before the drain plug in case you can't get it off.
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