i installed rsr down springs and kyb agx's on sat and i have a squeaking noise coming from the drivers side rear tire. it is a constant squeal in reverse and squeaks if i hit a bump when moving froward. the noise sounds like grinding metal or something to that effect. i haven't taken the wheel off yet too inspect it, but i wanted to get some ideas as to what may be causing it.

 

Sounds to me like an uper control arm bushing. You can pick up urathane aftermarket bushing and thye are a big help with suspension. Make it feel alot nicer.

Good luck

 

i would also try the brake dust shield, you might have bent it during the install and it might be grinding against the rotor...