Bonez

I am getting an annoying rattle , sounds like it is coming from under the car in the rear. It rattles really loud upon acceleration. It seems to rattle the most when its near the shift point, if I get on it, it seems to not happen most of the time , like going up a hill... It will get to the point where it would shift if you went a little faster but instead it cruises at that point and a hellacious rattle comes from the rear, nothing seems to be touching the body/frame/whatever underneath, but it rattles like hell? What should I be looking for?

Cat Man HHR

Shake the tail pipe and see if the exhaust might be loose.
Maybe a hanger broke ?
Shot in the dark with this one.

Oldblue

Loose rear shock bolts, brake hose brackets, EVAP canister.

donbrew

If something is causing a rattle noise then something is loose.

Bonez

It did have a rusted off hanger that my buddy welded back on ( in front of the muffler ) everything else is tight. Ive shook the hell out of it at the tailpipe and midway under the car, not a squeak? no rattles in the muffler or cat. Ive also checked the jack, spare and everything is tight. There is some sort of a taped onto the neg cable type of amp ring for current on heat? That was close to the body so I moved it away from the body more by flexing the neg cable away from the body... cant see anything that would cause a rattle like that? I am deaf but have cochlear implants so it drills into my skull and I hate it. Only time it does it is accelerating otherwise quiet but still annoying as hell and want to resolve it asap.

RJ_RS_SS_350

Rear spring broken?

Bonez

Rear spings are new, shocks are old

Oldblue

Are the shock bolts tight?

Bonez

Ill have to check when it stops raining. I did check the LCA and there is no movements, the passenger tie rod end is fairly easy to twist but the wheel doesn't move any where the drivers tie rod end is really tight, but the noise is coming from under the rear???? unless its fooling me?

Greybeard999

You say it has new rear springs... When springs are swapped the clips that hold the brake lines needs to be undone to get the axle to drop far enough. Are you sure the lines were clipped back into place securely after the springs were put in.

Also X2 for the shock bolts.