At the Jam over the weekend my left rear wheels begin making a popping noise. I took the tire off and tightened the hub nut about 1/2 a turn. (Actually tightened to 80lbs per book specs) I never heard another thing from it until I got it home now it pops like crazy. How can I tell if the noise is the the wheel bearing or the CV joint? My next question is how hard are they to replace or should I take it to the dealer? Any help is appreciated