Have a look in the tech section for the tranfer box

The gearbox i think is a torx for the filler and a 32mm socket for the drain. Not sure though, a google search should tell you as i did it last week
 
T55, for transfer box 1/2 inch drive from socket set and 19mm ish ring spanner, can't remember exactly. You will also need a syringe type oil pump or similar to stop you from getting a sleeve full of oil.
 
Undo the filler plug first before the drain plug, I had a hell of a time getting my filler plug out my gearbox, had to resort in using my snap on gun in the end.
 

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