If the trans is slipping, it is usually the result of bad clutches. Has the check engine light ever come on? Also, if it is just out of warranty, have you contacted the dealer?
As far as the trans filter, if you remove the trans pan, it is right there attached to the valve body. If you have never removed a trans pan, be careful because all the fluid will run out when it gets loose.
Let me know what you find.
Joe
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Saturday, May 1st, 2021 AT 6:28 PM