Hi,
If I had to guess, I would say the governor pressure sensor/solenoid has failed. What you need to do is get your hands on a scanner that can read transmission (TCM) codes. I have a feeling you will get a P1763 or P1764.
I attached a pic of the sensor and solenoid below. When you had things apart, is there any chance you could have damaged wiring to it?
Let me know.
Joe
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Saturday, May 1st, 2021 AT 5:59 PM