Me and my friends today finished installing coils on all 4 tires, we did the adjustments in the back by 3 inch drop but the fronts we didn't have time for because it got dark, my friend said I could drive it to work tomorrow and we'll do the front Thursday, I took it for a test drive and from the rear right tire I hear high pitch wirring scraping noise that get loud as a I speed up, is this because the front is higher than the back and it's putting more strain on the rear suspension? The front suspension are both currently different ride hieght on both sides of the car in the front.
Could be the backing plate that sits behind the brake rotors, unless you have drums in the rear then it won’t be that. If you do have rear discs the backing plate could’ve gotten bent while installing the coil overs. I would check that.
Thanks so much! It was actually kinda bent when we got the car but since the suspension was stock I never really heard anything after a year plus of driving, and we did use a really long pole to get the bolts off cause they were super stuck I will check!