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    2012 Yukon noise when accelerating and after shift

    2012 GMC Yukon SLT 4x4 with 6L80 MYC transmission and NPO transfer case, with 185,000 miles. Yukon drove fine until a cold snap then didn't want to move over 50 feet at a time. Changed fluid and filter, no chunkies in pan, but there was brown goo that looked like clutch lining material. Cleaned...

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