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I bet the pinion depth is wrong. Pinion depth has more to do with gear wear pattern and noise. They probably just reused the old pinion shim and didn't bother to check pinion depth because its a PITA to press the pinion bearing on and off to get the right pinion shim. Do as Jeff said and check the wear pattern. BTW, my 4.11's in my 9 inch were noisey from day one, not ear piercing loud, just abit noisey.
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Twisted Minds Racing
2000 SS M6
9.71 @ 142
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