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3/8" comes to mind, the problem is I had mine out recently but my 5/16 & 3/8 allen wrenches are still laying out on the bench & I'm not positive which one I used. :confused:
Out of curiosity, if you are changing the diff fliud, I would like to know if you removed the rear cover or are planning to suction out the goo through the fill plug. Also - what fluid are you using?
I believe you can suction it out of the diff (ski down it uses a shop vac) but if you are swapping gears, go ahead and put in a drain hole nn the bottom bolt hole of the cover.
Edit: Oh yeah, I use Amsoil 75-90 Synthetic. Some guys use the Mobil 1 with the same weights.