Transmission slips going into drive, it will also down shift ******* occasion I have a 2001 Volvo S40, after driving for about a half hour and a couple of stops at the store it will slip going into drive, it will also down shift ******* occasion, replaced some trans fuild (about 2 quarts) but it still does it, again this is only after it gets ran for a while. any ideas?

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Have you replaced the filter and fluid every two years or 24K miles? Try fresh filter and fluid as a cheap possible fix.
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