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Old 04-09-2002, 10:13 PM
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amg280 amg280 is offline
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Join Date: Apr 2002
Location: NY
Posts: 530
I have an 86 420SEL with 208,000 miles (I love it to death) and it has a bad differential in it. I have a good used unit out of a 560 im waiting to put in it. Mine sounds exactly like you describe. At around 80MPH, it gets pretty loud. the pitch on mine will vary with the amount of gas I give it. So when it starts making noise around 70, try feathering the gas and see if it goes away or not. Im guessing you have a bad differential, but like the others say it could be a bad bearing, although if it was that, the noise would be there all the time, and may go away when making a sharp turn. I also fine my bad differential is especially noisy on cold morning when the temp is in the 20's.
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