The bevel gear oil is supposed to be drained every 50K miles. There is a procedure to make this easier than trying to syphon it out from the filler hole:
http://volvospeed.com/volvo_repairs_how_tos/transmissions_driveshafts/awd_bevel_gear_service.html
Any good mechanic can do this, but I would perfer to DIY or an experianced Volvo guy who has done this before. I don't have a 90degree drill.
Could your noise come from a bad front axle CV joint? Bad bearing?
If all else fails, leave the bevel gear on the tranny and remove the prop shaft. This is easy to do and if you have storage, you can always put it back on. Just mark it up real good so it goes back on without being out of balance.
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