At 19,000+ miles on a 2004 Endeavor AWD (Mfr. Date 4/2003), I began getting a "whirring" sound from (I think) the drive train. Definitely not a belt whine, and doesn't seem to be a wheel or tire noise since it sounds the same on both sides. I followed the earlier thread on this issue that indicated possibly failing propeller shaft bearings or a rear diff problem. If any of you mechanics out there (like you, manybrews), have any further information or TSB's related to this issue, it would be greatly appreciated. Am taking the car to the dealer day after tommorrow. Thanks.