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1997 Oldsmobile Regency Question: Transmission shifting oddly

 

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PensFan, Crescent, PA, January 03, 2010, 16:49
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I'm not sure if it's slipping or just plain not shifting properly. Started about a month ago at about 45-55mph. It would jump back and forth when trying to upshift, if I tried to gain speed it evenually shifts up ok and runs fine. Gotten more pronounced the past week or so. From about 35-50 if I'm on a slight grade then it does it. If not it shifts fine and it's fine as slower speeds even climbing a steep street. I'm really hoping this is not serious. I put 1/2 qt of fluid in it because it was low but did not help. Could it be a faulty speed sensor? Anyone who checks this out and responds I really appreciate it. I forgot to add, it appears if I shift to D3 it shifts ok if that helps.

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