Though everybody out there might want to know what happened to me when I thought I heard wheel bearings humming. I checked and did replace the u-joints. My 940 had 208k on it so I decided to do it. Cost is not much and it only took me a couple of hours to do it. Still had what I thought was wheel bearing humming. I checked and spun all the tires, front and rear, and could tell that it just wasn't the bearings. When I changed the oil in it last week I did notice that the passenger side motor mount was crushed so I ordered 2 and replaced those. Thought that might solve it, but to no avail. I went looking for new tires since the Goodyear's that are on it have about 40k on them. Still have a lot of tread but I thought maybe one had a flat spot. I decided to rotate since the rear ones looked better than the fronts. I did the left side with no problem and then when I got to the right side to my surprise the front right wheel was loose. I remembered back that about a month ago I had taken my car in to Sam's and had the tires balanced, but not rotated since I had just done it. Well, to make a long story short, the "technician" that did the balancing forgot to torque the front right tire. I rotated them and checked all the pressures and END OF PROBLEM! Beware of what might become a REAL problem when you're having anything done to your wheels or tires. I had watched this guy do the balancing and I guess I just missed him tightening up and putting the final torque on it!!