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It has been a few years since that 740 - but I am thinking that when the car is moving, the drive shaft is turning - regardless of whether it is in neutral or not. The shaft would pick up speed with the car, thus the sound would change.
I did not have the proper tools to press the bearing out - so I had it installed. It was not that expensive. There is the bearing and the hanger. The bearing may be all you need - but it may be a good time to replace the hanger also - especially if with a heavy load you have experienced driveline thump from the driveshaft hitting the underside. If you don't experience this now (or have not) I am not sure that I would not leave well enough alone as far as the hanger (just my opinion).
If you do replace this - note that the bearing for the turbo driveshaft for most models I know of is a larger bearing than the NA (bigger dia. driveshaft).
You have followed the others hints to make sure that it is not a front bearing - right?
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"Be blessed in your quest'' 89 764 (110K), '94 940T (180K) , '92 745T (totaled 2-10-05 RIP)
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