Vibration in 2005 300 Limited
 

I have a 2005 300 Limited and get a vibration in the seating area between 35 and 45 mph. I took it back to the dealer 3 times so far and it still vibrates. They aligned the front end,balanced the tires, replaced rear wheels, and did a recall for the trans. tube seal leaking fluid into the torque converter. Any advice or coments would be appreciated. Thanks.