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I just purchased a 'new' 1972 240. It's a low mileage car in very good condition. The one thing that seems wrong is I'm getting a log of whine from the diff, especially in engine braking. The gear oil is fine in both the tranny and diff. The last time I drove a 240 was around 1985 when I drove my old one (still in the garage) but I don't remember hearing the diff that much. Is it normal to hear it more than modern cars (like my 535i) or should I expect the differential to blow up at 80mph on my way to work.
SoM
PS, oh yeah, this thing has a very stiff suspension which could add to the noise transmittion through the body. Beefed up springs, beefed up front anti-roll bar, added rear anti-roll bar, etc...
 

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dude,
I replaced my diff mount with solid metal one instead of the rubber sandwhiched
original. First thing I noticed was more road noise. If you have a R200 rear end those are pretty sturdy and usually take alot of abuse.
My 2¢
Ron
 
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