First. Do you have your T-bars cranked up? If you do, lower them down, thats putting a lot of stress on the rest of your suspension and your ride is stiffer. The fabtech spindles are known to go through ball joints pretty quickly (i know,i have fabtech spindles too) and since i work at Kragen, i bought some ball joints from my store and put them in and they still sucked. You have to get these ball joints from Moog (Kragen should carry them now, we just got our shipment in from moog) and they are "High angle" ball joints and fabtech reccomends you replace the stock ones with Moog's. I replaced mine with Moog ball joints and it helped a lot.
Second. check to see if your coil spring is settled all the way in, did you install the spindle yourself? If so, you might have put the spring in wrong (Its pretty easy to mess this one up so dont feel bad) And what your hearing is not the ball joints, but the springs trying to settle but cant because they are put in wrong. On the lower A arm there is a little dip where the tapered end of the spring is supposed to sit and if its not there, its going to sit funny and make noise when ANY stress/weight is put on it.....I.E. turns, bumps, dips etc
No. 7 Suspension