Loud Clunk noise when turning at low speeds on 2003 Chevrolet Impala

When I turn I hear and feel a loud pop/clunk noise coming from the floor panel/steering gear. I have replaced the follwing: power steering pump, rack & pining, one strut bearing, one ball joint, inner tie rods and I'm steel hearing the pop noise. I even started to feel it more after I replace the rack and pinion.

I'm thinking on replacing the other strut bearing, both outter tie rods and last will be to drop the subframe and check it for cracks.

Any help will be appreciated.

Asked by for the 2003 Chevrolet Impala
I first would try tightening all the suspension bolts, and the subframe bolts too.
1 more answer
How about the CV shafts did you check them? You can get a estimate here and find a shop here