In the alero the sure sign for a bad wheel hub is the three lights coming on.
If thats not happening and its not making a grinding type noise its probably OK. When the bearing goes out it will start like a low level growl- like a mild rumble strip. When they finally die they make a death screech noise... You will know when you get to that point... lol Scared the shit out of me. Im just glad I was within 1/4 mile or less from my work.
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-Ryan
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