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    Harsh shifts in 2004 Impala 3.4L

    I have a 2004 Impala 3.4L with 53k on it. It has been shift harshly recently. When the trans is cold it shifts butter smooth, but after about 15-20 miles of driving every shift is very hard. If I let the car cool for a few hours it shifts great again. That is for first 15-20 miles. Any thoughts?
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