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My 300TD has the same thing...rumble, only related to wheel speed, increases in pitch with higher road speed, doesn't change when I swerve, no change in volume when I coast in neutral. I figure it's gotta be a diff bearing or the center bearing. I realized I really wasn't prepared to change any of those myself right now, so I'm handing it over to the shop for diagnosis. They can no doubt put it up on a lift and run it to find the noise, something I can't safely do at home. It's quite loud and annoying at highway speed.
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