Moved to "Brakes, Suspension & Body Chassis".

 

Did you do an alignment when you put a new crossmember on? also endlinks need to be checked. That'd be my guess with the clunking. In fact get underneath the back and make sure every bolt is torque'd to spec (needs to be done with the wheels on the ground so you may need a ramps).

 

Yes i got a allignment done about a week after. At first after i got the alignment done the car felt normal, but it slowly started getting worse so i took it back to the alignment shop and they couldnt find anything wrong with it. But they just visually looked over it, they didnt take things apart and check everything.

 

Check the dog bone in the right side rear linkage

 

I just went under the car and everything seemed fine. Nothing was loose, mabye the rattle is something not suspension related? And could the wiggle be caused by a bad bushing?

 

noise and movement could both be due to bad bushing.

 

Sorry I didn't update earlier, but anyway, I ended up buying new rear shocks. It helped a lot. On the highway I don't feel the wiggle at all, and over bumps going left it still jumps a bit but no where near as bad as it used to be. As for the rattle, I still haven't found out what it is. I realized that I don't even have a rear sway bar, so it can't be endlinks.

 

I found my rattle in rear, it is the bumper brackets, must have been in a wreak before i got it, i have a bad wiggle too,

 

For the bumper brackets are you talking about the plastic ones on the side?

 

Bushing on one of the lower arms is the prime suspect when it wiggles, not keeping the wheels straight as it should.