sonowino

I have a 07 LS460. It has developed a steady vibration at 70 mph. The dealer did everything except look at the car. All they did was look at tires, which were 3 days brand new. They did the 'road force test'. It seems they have more experience with this issue than they are willing to admit. They tried to blame the vibration on the new tires, so I had the tire dealer replace them with better tires. Same thing. I had them replaced a 3rd time in two weeks, better tires each time. Still the car vibrates at 70. Same as 'Beniffnee' above. Finally after 3 sets of new tires, the dealer admitted finding the drive shaft needed balancing, the very item I asked the dealer to check from the 1st visit. The drive shaft was rotated 140 degrees. Wow. Secondly, I have a clink in the underside when I shift from park to reverse while in the garage on level ground, it does it too, shifting to drive. The dealer tells me there is a suspension problem that will cost $4000 to repair. Can anyone relate to this??? Control arms maybe???