This is the beginning stages of a failing transmission. This could be due to a leak in a clutch causing the slipping or it could just be a fluid issue.
So, we need to start with replacing the fluid and see if the operation improves.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
If it does not, then the fluid is turning dark due to the heat caused by the slipping clutch.
Basically, at this point we need to check the pressure and make sure that is within proper spec, but I suspect we will find it is going to be low which means we have leak internally.
I attached the process below on how to do it so let's run through this info and go from there. Thanks
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Monday, December 6th, 2021 AT 8:19 AM