I've had my tires replaced with new Pirerrli p3000'* and I still have the vibration. I've had four different shops do a tire rotation and balance as well, and I hvae brand new brakes all around. (pads and rotors.) My vibration wont' go away. :'(

I have this problem. With both sets of rims. I havnt tried to fix it yet though.

Ok so I'm not nuts....this is a good thing lol. No clue what it is though huh?

Ive heard a few opinions but they seem to all have to do with tires/wheels. IMO it can't be that because I have two sets. I'm gonna wait until I take my rims off for the winter and then take it in and see what belle tire has to say. Because they all will blame it on me having 20'* if I took it in now. Mines the worse at 65-70.

Oh man, don't get me started on this. :? I've put 3 sets super high performance tires on my car. Two sets had less than 5,000 miles. Can't remove the shake (more like a slight vibration). Suspension has been checked from top to bottom. No problems. Wheels/tires have received Hunter Road Force on 3 different machines. All say the balance is just peachy.

I've written this off to a freak of nature. I live with it. Sometimes temperature seems to aggravate it, sometimes not. Sometimes road surface seems to aggravate it, sometimes not. Sometimes the front wheels shimmy slightly, sometimes not. Sometimes the rear wheels shimmy slightly, sometimes not. Sometimes a certain speed seems to aggravate it, sometimes not. Shall I go on and on?.....................

So far have had the GSA'*, Pirelli P Zero Nero (2 sets; one replacement set under warranty), currently running Kuhmo ASX'* (huge mothers). I just live with it. The last guy I checked with said there is a tech service bulletin on full-size GM cars and trucks. Has something to do with the combination of suspension bushings and the aluminum suspension. Cost to replace with no guarantee of fix.... about $700. Priceless.

I have a vibration at about 68mph. It "fades" in and out sometimes. I know it'* not my tires (they were new and balanced) (Michelin MVV4 Energy Plus). When I drive on a highway for 10-20 miles the vibration seems to come and go about every 5 miles. It isn't severe but I can feel it in the seat and the steering wheel. I just had a outer tie rod replaced so my steering was also done . I can't explain this either but I figure something in the drivetrain has a "harmonic" frequency that causes this vibration.

I have it too. Happens between 50-70. Sometimes its bad, sometimes its not. I do need to have a complete alignment, balance and rotation. I was hoping it would go away after that was done, but now I'm not so sure. I'm definitly not looking forward to any long highway trips though.

This is definatley beginning to sound like a tire problem. Balancing machines only tell the tire person where to put the weights; however, it'* up to the tire person to actually take the care to put the weights in the spot where the machine recommends. Then they are spun up to speed a second time to see if the placement of the weights were correct. It'* the difference between the first spin and the second spin that determines the machine'* allowable tolerance for the techician'* error.

When I used to balance tires at a Toyota stealership, I would take great care in assuring that I placed the weights in exactly the spot where the machine wanted me to. That way if the tires were causing a shake on a customer'* car, I knew for certain that it was the machine at fault, and not me. :o

Ditto SappireTorrent and brianj. Getting rid of RSA’* made an improvement, but it still comes & goes. My older cars are more forgiving. They never had vibrations like this - even at twice the mileage and having run the tires thru entire tread life without re-balancing.

Although extremely rare, torque converters have been known to be out of balance causing vibrations; but in such an instance, vibrations are severe.