I recently had installed a 4.5 AEV SC kit on my 2010 JK. After driving it for a week I noticed when I hit a bump it would make a rattle around the rear tire side on the driver side. Today when I pulled in to my house I could here the rattle maybe in the front so now I'm kind of lost on where its coming from or what to do. The place I got the lift installed at tightened everything after 500 miles of driving on it and it still is rattling. Any advice or help is appreciated on this

 

Did you check your heat shield above the muffler? The welds are known to break... And they just sit in top of the muffler and bounce when you hit a bump. Does it sound like metal on metal?

 

Also check the upper rear shock mounts. Maybe grab a shock & try to move it, etc...the bar pins up there are known to make noise sometimes, that's why they make bar pin eliminators. One example:
http://www.northridge4x4.com/proddet...?prod=JKS-9607