The tool for the plug is a 14mm allen. If memory serves me there is only one plug for the front diff and it's a fill plug above the fluid level. So if I'm right you'll need to be able to suck out the gear oil, or drop it's sump pan. I remember when re-comissioning my TE I used an evacuator to suck out the gear oil in the front b/c it was really slow. If there had been a drain plug I'm sure I'd have used it instead.