Re: Pentastar vibration at 2000 rpm/60 mph
I had a similar vibration in my 04 Ford Mustang...I know, completely different car. However, the theory may apply. I had the Ford dealership look at it twice, and both times they aligned and rebalanced the tires. The problem never went away completely. However, when I replaced the shocks/struts and bought new tires, it is so much better.
I've found that Goodyear tires (OE) require more balancing than Bridgestone or Michelin.
If they rebalance your tires, they should ensure they use a good machine with road-force balancing.
You may also want them to check both driveshafts to ensure they're balanced.