Loud Noise

It was a good suggestion to flush the power steering system, it could be a power steering pump or steering box problem but as you know either would be expensive to replace. There is a company called Lubegaurd make a steering oil additive that is pretty good, I hear Lucas oil products make an additive that's pretty good worth a try.

I have a 2003 Silverado 1500HD with 140k miles and it has had this clunking noise from day 1. Took it to the dealership when still under warranty and they told me 'there are burrs on the crossmember causing the problem and we can't do anything about it'. Idiots. However, it has never caused a problem. The noise occurs mostly when I cut sharply at low speeds such as backing out of my driveway or a parking space.