Noticed odd rotational noise the day before Christmas on our "A" car - 2006 Subaru Legacy Outback 2.5i. The noise is Most noticeable at low speed, low pitch rotational scrubbing/squelching noise. Ran by shop where we have most of the work done on it and they isolated the problem to the rear drive shaft. Specifically, the central bearing set where the shaft is supported by a bracket. Consulted friend who is currently rebuilding a 1998 Outback Sport and he said he had not heard of this being a problem. He and I confirmed the diagnosis by putting up on stands. My questions, is this common? Repercussion of driving? Ordered used replacement shaft but still may not be here for a few days because of he holidays.