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2006 Trailblazer LS 4.2L I6
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25 Posts
dmtaurus, I realize this is a very old post, but did you ever discover the problem? Hearing the same noise on my '06 TBL. Thanks!
 

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Registered
2006 Trailblazer LS 4.2L I6
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25 Posts
I wish I could remember how I determined what was the hum but I sold it 2 years ago. However, after I did the tie rod end replacement, I did a check on the lower ball joints and found each side to have excessive play. I replaced both lower ball joints and while there also replaced both upper ball joints and the tie rod end on the passenger side. Now that I think about it, that helped to make it go down the road quieter when I did a road test in neutral and let it coast. After that replacement work, I took it and had the front end aligned and that, combined with the parts replacement, really helped quiet the front.
(y) Thanks for letting me know and taking the time to share a bit of info.
 
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