2009 4wdr Newby with driveshaft vibration and rear wheeel bearing concern

So, can wheel bearings be diagnosed using speed sensors ? Dealer replaced a front bearing when noise was in the rear. 1,000 miles later they want to replace a rear bearing...shaft vibration started after rear springs replacement was completed (recall). Angles were all wrong and carrier bearing has a ton of play now, but they are going with U joint replacement (first). Anybody else have post recall shakes ?