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had the same problem after they did yet another TSB fix for clicking rear half shafts.. For THAT they added washers to the half shafts near the real wheels.. THEN I started to have that resonance problem..so after MUCH service time they replaced both mufflers.. and.. it STILL gets the noise.. My concern is the other "fix" might just be adding too much directional torque to the half shafts OR the differential.. Who can help with this one cause GM sure can't figure it out
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