07navi
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WHY 86 ?
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Look I don't know much but I also would verify front brake not dragging. One way to do that is measure the rotor temperatures (left vs right) with a handheld non contact infrared thermometer. I recently associated a rubbing noise with a bad caliper using that method. One rotor was hotter than the other. BTW the noise was at lower speeds only and I could associate that with braking and it also didn't roll quite right.
Lots of good advice here. Look at EVERYTHING else before you open up that differential. Just about anything is more likely to be the problem.