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I had somewhat the same problem. The problem began at about 40k. After I put it into drive the engine would rev before the tranny engaged then it would clunk into first. The subsequent gears would be sluggish and once in a while the shifting would take on the same characterstics in the upper gears as it had from park to first. Well, my 01 Yukon xl had 50k and I needed tires because I had those horrific Wilderness LE's on it and it also needed it's first tranny fluid change and guess what? No more problem and the car drives better than it ever has. FYI, the tranny was clean with no mechanical problems either.
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