Hello,
Any time you have the transmission shifting hard, the first thing needs to be check is the fluid.
Make sure it is at correct level and in good/clean condition.
If the fluid checks out, then the issue could be due to a internal fault.
Like faulty shift solenoid or the valve body needs to be replaced.
If the internal fluid pressure is low then it can trigger hard shifting as well.
https://www.2carpros.com/articles/automatic-transmission-problems
Is your check engine light illuminated? Many times with transmission shifting issues the engine light gets triggered.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Retrieving the trouble codes can help with the diagnostics.
Please let me know of any questions.
Thank you.
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Thursday, September 23rd, 2021 AT 1:41 PM