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there are plenty of threads here about drive shaft vibrations. Sorry I dont know more, I just skim them over because I dont have that issue. Do a search for drive shaft vibrations.
I asked the same question not too long ago about my 2003 V-10 and got no where. Mine sounds like a slight rumble between 50-60 mph. Very annoying almost like a sub woofer at a low frequency. I'm trying to pin pont it so I don't have to spend tons of $$$$ trying to fix it. Someone here has to know what the h$ll it is.
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