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Re: 97 altima loud noise from front end
It could still be a number of things. Check for proper tire inflation (indicated on your driver-side door-jamb info sticker). Tires may have uneven wear from your previous mis-alignment. Wheel bearings could be going bad, which would cause sort of a mild humming sound to a loud roar if really bad. It is possible that your brake pads could be rubbing your rotors, but that's very unlikely.
To check for a bad bearing, engage your emergency brake and carefully jack up the front end of your car. I assume you know how to do this safely, but if not don't proceed unless you know how to do this correctly. Once one of your tires is completely off of the ground move the transmission into neutral (you will have to turn your key to the ACC position first). Slowly start to rotate the free tire with your hand and listen for any strange noises. Gradually increase the speed of rotation. You might hear a mild 'scraping' noise from your brake pads slightly touching your rotors; this could be due to warped rotors, but this is likely not going to be the "loud" noise you are encountering at your front end. If you start to hear a sort of "grinding" noise and feel a little bit of friction as you increase the speed of rotation then this could most likely be a bad wheel bearing.
Note: bad wheel bearings are notorious for becoming very very very loud, almost deafening at highway speeds; warped rotors make a noise only during portions of the wheel rotation where the pad touches the warped portion of the rotor, but a bad bearing is a consistent noise throughout the entire wheel rotation.
Let me know what you find!
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