Actually, it is common for the axle seals to leak. Just make sure to check the fluid level on a regular basis. As far as the noise, it sounds like a belt noise based on your description. Try this. With the engine running and vehicle in park with the park brake secured, open the hood and pour a small amoung of water on the accessory belts. Does the sound change? Make sure to protect your eyes and clothing because water will most likely spray back at you.
Let me know what you find.
Joe
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Tuesday, November 3rd, 2009 AT 10:28 PM