This sounds most like the fluid is the issue. However, it could also be the pressure regulating solenoid. I attached the process on how to replace this but we need to monitor the line pressure to confirm it is not operating properly. The last two attachments are the procedure on how to do this.
This is all assuming this is an automatic transmission. Let me know if you have questions. Thanks
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Saturday, November 2nd, 2019 AT 3:15 PM