Once you pop the smoke color cover off there is a small filler hole to fill the resi. If I'm not mistaken ur suppose to use atf. Ur gonna need a small funnel so u don't get fluid all over cause its a biotch hahahaha

SRC
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Tim over at place diverter says to pull it out and fill with Auto Trans Fluid or ATF for short, but that was also cause mine was easily accessible and able to be pulled out. If it's mounted at an angle though try and keep it at that angle when filling so you don't over fill.