Re: rear end noise
To diagnose a bad bearing yourself it's best to jack up the wheel enough so you can get your hand underneath. Spinning the tire won't do anything except give you exercise. Place one hand on the bottom and one hand on the top of the wheel and rock it towards you, if there's play or any noise you know the bearing's shot. I can't say I've ever tried that method on a rear wheel bearing before but it should work as good as the front!
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!