There will be a plug aprox half way up the case on the side (not sure which, check your hanes/chilton manule, or any jeep owners help), that is your fill point/level check point. take the plug out and stick your finder (pinky or if you have big fingers, a "probe") in. you should feel fluid just below the opening. add till it comes to the bottom of the fill hole. ensure your jeep is on level ground when you do this to ensure proper fill.