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Re: deep rumble and small vibration 63 to 73 MPH
I've got 96 Yukon (same thing as a Tahoe, just a GMC) with a little over 100,000 miles. I'm on my third rear u-joint (one by the rear diff). What you described sounds like what I have found when my u-joint is starting to fail. I don't think it's a case where the u-joint is loose...I think when the u-joint starts to go, it becomes stiffer becuase the needle bearings are wearing out. It should a under $100 dollar repair for the u-joint.
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