2004 BMW 325 Rhumbling down the road

Drive Train Axles Bearings problem
2004 BMW 325 6 cyl Two Wheel Drive Automatic 46k miles

2004-325i, 46K miles: have a rhumbling as we roll, sounds like bearings. Lifted the front, they sound fine, slight disc rubbing. Rear, in neutral, seem to click, not clunk. Saw bearings on autowarehouse, one with a housing and the other with just a bearing. What else can I do before I replace the bearing? Also, with the hub or single bearing. Thanks, Doug in Miss.