most likely the steering gear bushing.
It usually makes a clunking sound. Usually in cold weather.
What happens is the bushing gets hard and elongates a bit- allowing a little bit of movement
So usually winter- when going in/backing out of driveway- youll hear a clunk.
Its not detrimental to your driving.
The bushing can be replaced when the PS rack is replaced.
Since its an involved job.... thats when youd want to replace it.
If you have worn suspension pieces- the noise may be more apparent.
2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L - 83,000
2010 Traverse 3.6L- 148,000
2003 Trailblazer 4.2L- 181,500