I recently had my 2002 4WD Explorer in to the dealer's shop for OLF and tire rotation. It had 72500 miles on it at the time. Anyways, the service manager called to say that my rear wheel bearings needed to be replaced. The estimate was $1300!! I asked him how bad it was and he said that the technician was surprised I hadn't been complaining about the noise. Problem is, I don't hear any noise! It seems to be fine. Any other symptoms I should be experiencing if they are really shot? Also, does the $1300 price tag sound reasonable? I'm going to get other opinions, but would appreciate having a ball park price that I should be paying. Thanks in advance.