suspension problem

[wonl2]

I own a 2006 300C with 82,000 miles. The car shakes between the speeds of 37 and 47MPH. I had the tires rotated, balanced and the front end aligned. Both driver and passenger inner/outer tie rods were replaced (passenger inner was bad). The tires/rims are original and along with the suspension. It seems that the shaking is in the seats. I don't feel it in the steering wheel. It also seems that the shaking decreases/stops when the brakes are applied lightly. There is no pulsing in the brake pedal. I actually replaced each tire with the spare to see if it is a broken belt. The shaking was still present. The tires are Goodyear Assurance. The shaking only happens at this speed. Any suggestions? Thanks for your help.

wonl2

[Blue300]

How good is the tread on the tires? If you pass your hand along the tread clockwise and you feel the tread in an up and down motion, it could be your tires are wearing uneven. Therefore, it could be causing your vehicle to shake.