schapman

I need some help figuring out what is causing this noise. it happens when you hit a bump while driving that causes the sound.
Its sound ting of like growning/trattle sound. Ive checked the back end and actually put rubber pads between the exhaust and metal body parts.
I have about 1"-1.5" between the bumpstops. car has had vogland and eibach springs with d-specs.

Rubrignitz

Detail your entire rear setup. Do you just have the springs/shocks? Do you have a 1-piece or stock driveshaft? Stock upper/lower control arms and panhard setup?

Lowering the car can cause multiple issues if you dont adjust your pinion angle with adjustable lower control arms and/or upper. And you need an adjustable panhard rod to re-center your rear end when lowering these cars.

There can also be issues if you tightened everything up w/o your rear suspension loaded. More info please.

hammeron

i read somewhere, that replacement rear
springs, have to be clocked a certain way
to avoid noises

i'll try to find the link.....

RhinoGT

Do you have an aftermarket axleback?? Some of the axlebacks w/ bigger tips hit the rear bumper support when you hit bumps. Also, one common noise that comes from the rear end is the trunk shocks. Try wrapping rubber bands around the schocks' tips where they clip in.