I have a 2012 Mustang
GT and just had it lowered with eibach pro kit with dampers. I have noticed a weird squealing noise from the rear end (i think) that only does it early in the morning (around 5am) and it does it even if I am on a normal road (not over speed bumps). I have opened the back seats and set my phone in the back seat to pick up the sound of it the best I can. I will put it in a youtube video to show the sound and since youtube would not just allow me to upload an audio clip, I had to create a non relevant video clip as well. I will post the link below. I did take it to the shop that installed the kit and of course they could not reproduce the noise and said it might just be moisture in the LCA or lower ball joint seals. I also thought it was the strut mounts but now I am almost certain it is coming from the rear. Please let me know what you think.
Car squeeking noise - YouTube