Oil drain location - 2001 4x4

OK,

I have changed the oil on my Volvos more than once, but I am having some trouble finding the oil drain on my wife's Jimmy. The main concern is that I don't want to get a plug associated with thefront differential.

I am assuming that it is the plug that is found near the back of the engine. The plug is facing towards the back of the truck, found in a kind of notch in the second (as you work back from the front) skid plate.

Here are the issues:
1) it apeared to have some sort of blue wax or crayon on it (I would assume to show where it lined up to when putting it back in)
2) It is tighter than all get out. I am concerned it may be the wrong one.

I know this seems obvious, but I don't want to drain the wrong fluid, and earn the ire of my wife.

Thanks,
Jeff

It will be obvious which one it is.

It is the only drainplug in the bottom of the pan.

Remember, counterclockwise to loosen it.