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2006 chevy trailblazer_ls_ext
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My truck has just over 100,000 miles on it. A couple of weeks ago it started making a metal on metal noise. It does this when I am driving from 36 mph to 38 mph and again at 56 mph to 58 mph. I am thinking tranmission? :confused:
 

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2004 gmc
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Front or rear or middle? Any way to localize it?

Could be front or rear bearings, differential, brake shields, or any of a dozen other things. Got to get it supported or on a lift and look.

Did you perform all the 100K mileage service items? Very important stuff there including the differential fluid.
 
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