My 1997 Chevrolet Blazer.?

Question:
It has 104000 miles I am hearing a noise(not in brakes)from the front end.I hear a grinding noise when backing up
and a high pitch humming sound when going forward which goes away after driving awhile. The noise starts again all over after the car sits awhile.
I have had the breaks checked and it is not comeing from them.
What do you think it might be?

Answers:

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How cold is it where you are... could have moisture in the front diff that freezes when it sits. Check the gear oil, if it's a milky colour change it out.

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transmission or differential if the humming starts and stop while driving forwardly check the wheel bering.

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I say drive it into the river, you never know it may work.

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Check your wheel bearings and also the u-joints. The grinding makes me think something is worn out.

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