front strut binding when turning

i have a 96 grand prix 3.1. When i turn my wheel left or right i get this thumping noise in the front right strut area. I looked at it while someone was turning the wheel and it seems that where the bottom part of the spring sits it binds up and clunks when it turns. I dont know what would cause it or what to replace. I cant find any parts at autozone. I just replaced the strut cartidges a few months back and now this is starting up.

Ball joints binding? If you turn the wheel one direction while driving (ie making a 90 degree turn), when you return to center will your car now pull to that direction?

How many miles on car? Sounds like rubber mount pad under spring is worn badly or gone.