This is likely due to the unit that sends the speed signal to the computer. Without this information the speedometer won't work and neither will the odometer/tripmeter. without the speed signal the computer has to use other information like engine speed to determine shift timing, but that is less accurate that ground speed and so it won't shift as smooth. I would start by checking the sensor located at the back of the trans on 2wd and in the transfer case in 4x4 models.
Is the ABS light on? the Rear Wheel Speed Sensor is a common problem. Its located on the top of the rear axle.
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