Would this be the noise i have while decelerating in gear?
Sounds like a bunch of marbles rolling in a coffee can

 

I have the same noise going on I think. I was thinking it was the exhaust to tight next to something somewhere, but I searched and searched and tapped around and revved up on a lift and could never get the sound to duplicate, unless I was on the road with the car, and decelerating, while the car was holding back rather hard. As soon as the RPMs would drop it would stop it, and as soon as you give it a little gas while its making the noise, it would also stop. But let off the gas and let the car hold back again and it would make the noise again. Ever since my new build has been together it has done it. The prop shaft bushings make total sense! I didn't even think of them, bc if the car is holding back and putting adverse tension on the drive-shaft, and mounting brackets may vibrate against the stud and or frame under tension in that direction if the oem rubber bushings are shot, then get on the gas and it would separate and stop. I'm going to try replacing those bushings with these, http://www.maperformance.com/beatrus...051pmb-2t.html and see what happens! Thanks Blitz_b9! Epiphany moment!

 

Reving this thread from the dead. OP did you ever find the source of the noise?

 

I did, two different occasions. First time it was the shim on my brake pad, it had fallen out of place.
second time was after I got my fenders rolled, the inner fender liner was rubbing the inside of my wheel.

 

Whenever the shim fell out of place did it sound like this when you were off throttle?

https://imgur.com/gallery/9QSCHb0?s=sms

 

No it didn’t like that, wasn’t as harsh sounding