i have a 2003gmc z71 and every time i make a left turn it makes a clunk noise. it doesnt sound like a ball joint, could it possibly be the shock and is there any ay to tell if it is

Could be a shock, could be a CV axle, could be the sway bar end links, could be the sway bar frame bushings, could be control arm bushings. To test the shock, go to the suspect side, push down on the vehicle, it should rebound no more than twice before settling again. To check for the other pars, you'll ahve to get the side up in the air. A CV axle would probably have a busted boot and grease leaking out of it. The sway bar would have excessive play at the end links, or at the frame bushings if they are suspect The control arm would have a WHOLE lot of excessive play in it, and you'd also probably have trouble keeping her aligned. Check those things then get back.