I've got at '06 GT (43,000 miles - daily driver - excellent condition) with a headshake problem.

First noticed it a few months ago when braking. We (mechanic & I) figured warped rotors were the culprit. So,,, I swapped out the rotors and pads. Everything seemed fine for about 1 week.

Then I started noticing headshake on acceleration. We figured worn inner & outer tie rods were the culprit. So,,, I swapped out the tie rods and threw on a bumpsteer kit. We rotated the tires too. Everything seemed fine for about 1 week.

And now,,, it's still shaking through the steering wheel under acceleration.

What gives ???

 

Check tires for balance...you may have lost a weight... and have tires checked for tread seperation.