I've got a month old problem thats came down to me checking them. I can take a pry bar and move the carrier up and down. I can't see it but I can feel a slight movement and mostly I can hear the slop as the grease "smacks" as the bearings move in the race. But the pinion "appears" tight. I can't make it move a bit, not saying that the engine torque doesn't move it though. I'm trying to fix this on my own. Having never set up a rear end i'm fearing having to set it up. But I know I can throw a set of carrier bearings in it. Bottom line is i'm trying to turn 800$ into a 150$ fix.