Popping noise in front end both sides when turning wheels on slow speed and stop

Just received vehicle had mild popping noise in front end both sides when turning wheels on slow speed and stop. Husband has replaced shocks. But now problem seems to have worsened not better. Sealed boots for greasing, not sure what to look at next. Everything seems to be intact not worn out (tie rods and such) if you were to lubricate suspension system (going try to see if noise popping goes away).
Where would you start, which lube. Silicon or lithium and why?
Thank you.