You'll need a 24 mm socket, preferably a 6 point, and a breaker bar is nice too but do NOT re-tighten the plugs with the bar, use a torque wrench. I can't remember what size the socket head plugs are on the front diff but like someone said, they are in there very tight. Take the fill plug out first to see if it will even come out, so you don't drain all your fluid and end up not being able to put it back in, which would suck. The differential drain plugs have magnets, clean 'em off. Don't get the gear oil on you or you will stink something fierce.