I have a 2015 Challenger Hellcat and for over 6 months there has been a groaning noise coming from my rear end that has gotten progressively worse. I went to the dealership and said that “I needed new control arms” and that it would be over $1000, so I declined and decided I was going to do it myself. Has anyone had a similar problem and if so how did you fix it? What parts did you get/ replace? Any help would be greatly appreciated.