I noticed the moser 12 bolt is loud, but there is a scrapping noise coming from somehwere, but I cant figure out where. I thought it was the breaks, but the rotors arent heating up or being cut into. It doesnt happen all the time, if I hit a bump itll stop for a few seconds, slowing down and breaking. I dont feel any lag in the breaks or anything. Any ideas? If you are sitting in the drivers seat the sound comes from the left in the middle. A friend was sitting in the back and he said it was coming right underneath? Need some help! Thanks!!!

 

Did you have to clearance the tunnel near where the torque arm bolts to the rearend? I needed an extra 1/2". Check to see how much room you have there and if there is any marks from scraping.

 

Alright, Ill check that. Any other ideas?

 

double check you 4 bolt flanges and make sure they are tight, sounds like your rotor mounts are binding.
you should be able to use a 3/8 inch ratchet with a small 9/16 socket.

also you didn't say what year the car was, are the parking brakes the type with the ring inside of the rotor, i have the same set-up on my 99 silverado and they always make a slight rubbing noise. i've tried to adjust the ring and not use my parking brake but they still make noise.