If it’s a clunking noise in Cavalier Sunfire 1995-2005
Those model years of Cavaliers have a service bulletin.
When there is a clunking sound turning all the way right and left,
it is the splined shaft between the steering wheel and the rack.
Chevy sells a little kit with a tube of lube they recommend for the splined shaft.
Your supposed to take it all apart to lube it, but my mechanic got it into the top of the
steering shaft through or around the rubber boot.
It took a while for the lube to work itself in, but it worked.
The spline is so the shaft can shorten and lengthen as needed.
When it sticks it makes a noise each time it breaks free.
In the picture your can see where the shaft telescopes into itself.