I get the kind of the same thing. But it is in the front end and my OD is off. My vibration is between 40-45 mph. I checked my ball joint by jacking up the truck and seeing if I can shake the tires but they seem good. I'm wondering if my tires need to be rebalanced.. HUM... DDGETHS
I had a similar problem on my Dodge. I had a spark plug wire burn through the first time because it fell on the header. The second time there was a vacuum hose disconnected from the EGR valve running to the EGR motor. Those would be the two things I would check first.
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