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The 1-2 shift point is determined by the governor pressure inside the transmission, the PCM regulates governor pressure based on engine temperature, transmission fluid temp, and throttle position.
If the PCM detects that there is a problem with an input signal used for controlling the transmission the governor pressure will go high which will cause symptoms such as delayed shifts that are harsh and the transmission may not go into overdrive.
As a start you should check the PCM for any codes.
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