Transmission keeps slipping in and out of over drive how do I fix this

2000 PONTIAC TRANS AM
135,000 MILES
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RANDY.PRATER67
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I have replaced the filter and fluids a
May 25, 2012 at 9:53 PM
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RASMATAZ
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Scan the computer/TCM for code/s-start here
May 25, 2012 at 10:01 PM