There's an actual service bulletin and official kit that worked like a charm for me. I'll post the link later. It actually has a plug to keep the grease in.
I have the clunk in the impala, it drives me nuts! I have the entire power steering system parts that I’ll be replacing soon and I got the official delco kit for the iss from rockauto. And I hope it fixes it.
No more GP 04 Impala SS Indy:
Gen V 3.4”|FWI|N* TB lq4 MAF|1.9 Modded Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|