Depending on engine that would be a 46RE or 47RE, either way the governor pressure is electronically controlled, and it has a T/V cable ( throttle valve). Look at both of these these things listed below,
The T/V cable and linkage. This is the cable and link arm that is on the same shaft as the shift linkage at the trans. There should be a spring on the link pulling it forward (attached to link and a bracket on bellhousing bolt. The link arm is suppose to be pulled forward and throttle input pulls it back. If the spring is broken, missing or something binding like frayed cable etc this link might get pulled back and not returning forward not allowing upshifts (simulated WOT).
The governor speed sensor is at the back of the trans on the drivers side, behind the pan or on the tailshaft. If that sensor fails it will not upshift. You can test this sensor but usually they fail by coming apart. The sensor is plastic and has a large hex to unscrew it from trans, there is a magnet on the end of sensor that usually breaks apart causing sudden failure.
Those are the only two things external that would cause upshift problems in 1-3, all other problems are internal.
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