Popping in front.

[J Wikoff]

What's that casting number? There are different numbers on the updated LCAs. Posted around here somewhere.

[Rubberman]

this is just a general pic from google. not my actual car. end links are new on my car.

[Cooper]

How did you torque the LCA's. Below link is for the new LCA's with GM part numbers.

http://paceperformance.com/i-7138834...l-arm-kit.html

[hflores3]

Attachment 27522

The Lower and upper control arms look original-recommend replacing, can cause this issue.

also your sway bar end link looks dry, I would replace that also.

Cooper is giving your "sound" advice.

Recently had the "very same" problem
a) replaced both upper and lower control arms - it's not too hard.
b) replaced end links - walk in the park!
c) Problem "gone"