hi i lowered my 2010 ss and now theres a cluncking noise in the rear i checked and rechecked all the bolts and torqued them. all i did was changed the springs i have done this a thousand times on all kinds of cars and trucks and never had this problem
please can anyone help

 

Was there a rubber bumper between the springs and the chassis?

 

^My guess too.

 

That is exactly what I was going to suggest. I have a 2011 SS and it is doing the same thing, it took me a minute to figure out where the noise was coming from . I took it up to a muffler shop by my house and had them put it on a lift and sure enough the rubber boot was worn on the passenger side spring. I haven't had the car very long and it had under 50k miles on it , i have a warranty on it so im gonna take it to the dealership and have it fixed