Im getting a loud whine/whirring sound at around 65mph in my 91 fj80 from the front of the truck, only with my foot on the gas. This seems to be a common problem from what i have read. My front drive shaft squeaks at low speed as well, but Im not sure if the two are related. I changed the fluids in the xfer case and front diff but the whine is still there. From my hours of searching, I am thinking it is the front pinion bearing, drive shaft, or drive flanges (any other suggestions would be helpful). I have to drive about an hour out of town today, but I am worried that something might blow up at speed. Is this a logical concern?