I don't know if it will do any good to add this problem to the already numerous vibration problem threads or start new.
Yes, I have a new "left over" 08 that has a vibration from about 50 mph to whatever..... I haven't driven over 60 MPH yet because the manual says not to for the break in period.
There appears to be an obvious problem with either the type of tires that Hyundai uses ( Bridgestone), or Driveshafts needing to be rebalanced or, or, or,....
If there are truely any Hyundai mechanics on this forum, online, then why don't all these complaints get back to the manufacturer ???
I would like to think that a company with such a high rating would want to step up to the plate and listen to their customers and TAKE CARE of the problems at hand. Then the "high rating" would include "no problems with vibrations". I hope they are not just another car company that figures it CHEAPER to not fix it.
There, I got this off my chest. Look Hyundai, these threads are not going away and more and more are coming. potential buyers are going to hear about these problems and steer away from hyundai and start looking at the VUE. I hope I don't wish I did.

30_30 Win

 

There is only so many possible parts which could cause this rear end vibration. They are: The tires, the wheels, the bearings, or the driveshafts. The likely hood of there being a problem with the driveshafts or the bearings is low, so that leaves the wheels and tires.

The problem with your particular car is that it probably sat on the dealers lot for a year on the tires, which were low on air and made flat spots. It's totally common.

The warranty dilemma is that this is not a "factory defect" and Hyundai MC has no responsibility to pay for the fix, as that particular problem was caused by poor dealer maintainence, and the dealers inability to sell the car. The dealers of course being what they are, are not motivated to go out and buy you a new set of tires.

There's a HMC technical service bulletin that identifies the problem, and to do "load force balancing" on the tires, but it won't work because it's the tires that are warped, not the balance job.

It's partially your fault for not adequately test driving the car which you were actually going to buy.

So I wouldn't complain too much about HMC, as this was not their fault really. This problem could happen to any car. This is the dealer's fault for not taking care of the car, and your fault for buying it that way.

So good luck with it, but I think you'll wind up buying new tires.