hi i am shannon i will help on this issue
you need to remove the transmission oil pan and clean or replace the oil filter
the next thing to do would be put a line pressure guage on and see what the line pressure is
i can get byou the location and pressure if you can find a transmission pressure guage .
but please cheak the filter frist.
if the filter checks out ok then please retrieve the transmission codes . hear is the presager.
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