Hello,
It sounds like there is an issue with the transmission valve body.
It is likely not producing sufficient pressure to perform the shifts.
The valve body has pressure regulator built in that helps with keeping the fluid pressure at a certain level.
Typically, the issue will happen on higher gear similar to what you are experiencing.
Any time you have shifting issue it is a good idea to make sure the transmission fluid is at correct level and is in good condition.
https://www.2carpros.com/articles/automatic-transmission-problems
I have attached diagrams for your reference.
Please let me know of any questions.
Thank you.
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Tuesday, September 28th, 2021 AT 7:41 AM