ooohh that would drive me nuts.
My truck had that sort of thing going on, new steer tires and everyhting is good but seeing that you have had tires replaced, we can discount that. Have you checked your wheel bearings, I suppose you would have at some stage in 13 years.
Wheel alignment?
I would be inclined to remove the drive shaft or at least securely put the back end on axle stands and get up to the magic 75-80. Actually perhaps put it up on stands and see, if the vibration is there, removed drive shaft, if vibration is gone, drive shaft is out of balance.
Perhaps you hit a gutter a bit hard and bent something?
Things like worn bushes would not be culprit as they would get worser and worser with age. That's the strange thing, usually if it is caused by worn parts, it would get badder. Feeling a vibration is pretty useless as the vibration is transferred through the car.

Hendrik
who does not vibrate

On 02/03/14 10:29, kdwittne...@yahoo.com wrote:
with lots of good tire shops changing tires and balancing rotating over the 
years,  nobody ever said a wheel was out of true. so unlikely I concede.

so maybe that joint.  feels like it is under the console or seat. Seems like 
maybe 120hz at 75mph. vibration,  not much sound.  stops again above 80.

I have driven it that way since 2001. nobody can figure it out,  but most 
mechanics never test drive at that speed.

k


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