More of a low frequency vibration than a noise. Really can't "hear" it, more of a feel.
At about a 1 hertz cycle I feel this when rolling at 70 mph or so. Seems like it might be coming from the rear but it's really hard to localize that low of a frequency.

Bearing, rear diff?

__________________
Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD