Sounds like the trans may be experiencing low line pressure... You might try replacing the fluid and filter again and see if that does any good... almost sounds like the Pump is getting weak..
You checked the fluid with it warm, engine idling you placed the shifter in every gear range for a couple of seconds then to park correct? At this point after wiping the fluid off the stick, and rechecking the fluid should be in the center of the cross hatched area...
Guys? any other suggestions?
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