I have a 2006 Trialblazer LT 4x4. Every once in a while on rough roads I will get a banging noise, it will bang two or three times. It sounds like something is loose. I thought it may be a bad strut, but the strut is not leaking any oil or is it loose. I looked all over the front end and could not see anything loose. I've only had the Trailblazer for about six months.
Bob
Bob