This sounds like a fluid issue so I think you are on the right path with starting with checking the fluid. However, you don't have a traditional method of checking the fluid. I attached the process. You need a dipstick with the correct part number in order to check this and then a scan tool to see what the fluid temp is in order to determine if it is low or not.
Clearly this is not an easy process and they make it that way because they don't want people adding fluid to this transmission because if they check it without knowing the fluid temp then they will not get it correct.
If we can confirm the fluid is at the correct level and in good condition then there is a trick that we can try to minimize this. The trick is to add a friction modifier to the transmission to see if the clutches will stop slipping or chattering.
I would suggest stopping by a dealer and asking them to just check the fluid level and condition as they will have the proper tool. Then we can go from there. Thanks
Images (Click to enlarge)
Wednesday, June 24th, 2020 AT 12:14 PM