Sorry - I should have clarified the bushings were the LCA to spindle and LCA to body. I pressed in a spherical bearing for the LCA to body and a Ford Racing bushing for the LCA to spindle. I could have caused the problem by tightening up some of the mods with the suspension drooped. I’m more...
Thanks for the comments. The only mod so far that I’ve noticed NVH was the urethane differential bushing inserts. Once I put them in the it whined like a pig when I would let off the accelerator but that was before I pushed in new bushing and bearings so I could have had a few other factors...
Thanks for the suggestions on a start. You are one of the first I’ve read to have the rears softer than the front but the more I read the more I see this as the suggestion for highway driving so I’ll give it a shot.
I have done a few mods (OK a lot but my wife still thinks it's factory!) since we bought the 2015 s550 for my wife but the latest mod (Steeda minimum drop springs with Steeda Proaction Adjustable shocks and struts) has me searching forums and trying multiple rebound settings but the car is still...