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The problem you describe is most likely caused by the output shaft speed sensor. If it was the turbine speed sensor it would not affect the speedometer.
Here is the procedure for replacing it. You will lose a little bit of fluid. You could drain the transmission first, but it isn't essential. You can just fill it back up once you have the new sensor in.
Hi, I just wanted to see if you needed any additional information. Also, if I have been of some assistance I would appreciate a positive rating.