Clunking in the rear after BC Coilover install

[Loader]

Hey guys, I've been trying to find this clunk in the rear of my car. I recently installed BC Coilovers this past weekend and everything went smoothly. All the bolts were tightened and I even triple checked. The clunking noise only happens when driving under 40mph. I crawl under the car and check but can't find the problem. Anyone have an idea of what this could be? It is only on the driver side. Any help would be appreciated. Thanks!

 

[djltoronto]

Hey guys, I've been trying to find this clunk in the rear of my car. I recently installed BC Coilovers this past weekend and everything went smoothly. All the bolts were tightened and I even triple checked. The clunking noise only happens when driving under 40mph. I crawl under the car and check but can't find the problem. Anyone have an idea of what this could be? It is only on the driver side. Any help would be appreciated. Thanks!

One of the sway bar end links isn't tight!
just a guess!

 

[lukydog]

One of the sway bar end links isn't tight!
just a guess!

99.99% of the time thats it. Once the clunk was a wrench floating around the spare area. (unamused)