I noticed this morning on the way to work that when I pulled into my parking lot I heard some groaning/ squeaking coming from the rear end over bumps. Then on the way home I turned the radio down and I noticed it quite often every time I went over a bump or uneven pavement. I've had the front lower control arms replace last summer and the sound is quite similar, and every once in awhile I do notice a little clunk. Anyone had any rear suspension issues? Thanks.
check to see if it's your brakes. I have a 2013 V6 and for some reason my left rear brake squeaks going over bumps and uneven surface. I thought it was suspension sound for the longest time until I used wireless chassis ears and found out the source was from my rear left brake. It was confirmed to be brakes when I did brakes upgrade and changed my entire setup. I am guessing the brakes were trapping brake dusts and making sounds on mine. Not sure if it's the same issue as yours but doesn't hurt for them to check since it's under warranty
I had a similar thing with my 2013 and had to get the sway bar end links replaced.
That's exactly what ford replaced. All seems good. They weren't surprised when I told them the noise in the rear and were quick to say 99% its the sway bar end links. Maybe its a common issue for them on mustangs Idk.