dgadkins

I have an automatic 2010 GT Stang. I just had to place lock nuts on my panhard bar due to the bolts somehow becoming loose. It would cause my back end to shake left-to-right when I would initially place my foot on the pedal and let off the pedal. Also, if I would keep my foot pressed on the pedal to try to cruise, my back end would shake vigorously. After getting the lock nuts put on, I am now begging to feel a shake when I press the gas, and let off the pedal. But very slightly. Now a new issue has popped up, as I am cruising from 45 and up in speeds when the pedal is pressed down (not flooring, but slightly pressed) my car feels as if it is shaking front to back now, and feels as if my left rear tire is skipping down the road. I turned my O/D off and it actually began to run smoother, but there was still the left-to-right shaking. I need help, and advise on what I should do. Thank you.

Derf00

Have you had your rear lower control arms out for any reason?

If you have , make sure you put them back in correctly. They are slightly offset from and there is a correct and incorrect way to put them in.

If not:
Check your rear lower control arms (especially the one on the left side). First check to see if the bushings are in good condition or not. If you see cracks they are probably deeper than they look (tears). Secondly, if they appear ok, check for tightness of the bolts. 129 ft/lbs. It needs to be done with the suspension loaded (weight of the car on the rear axle).

If that checked out okay, I'd look at the upper control arm. Ford has a funky design where they use a hydraulic bushing and an undersized bolt for the hole that it goes through. This is to soften the ride but can lead to problems as the bushing wears out and things get sloppy.