Tranny slipping/torque converter bad?

My 2001 v6 4x4 tranny is slipping on the highway./it's fine around town and fine on the flats but when you punch it the rpm climb and the mph stays till or drops. I dropped the pan (it was clean) changed fluid and filter and I didn't help . The tranny shifts fine ..... So it it the torque converter? Help help

 

Have you tried to manually shift the transmission through the gear ranges ?
This is going to help you determine what gear the transmission is slipping in .
Are you checking the transmission fluid with the engine running and warmed up in park ?
Sounds to me like you have a downshift issue .
When you are on the highway and try to pass someone , does it feel like the transmission goes into neutral ? I doubt its your torque converter
They call this run away kickdown and there are a few things that can cause it .
I have some info here all about problems with the A340 series transmissions .
http://www.tacomaworld.com/forum/te...warner-340-series-transmissions-write-up.html
At this point in time , I would recommend taking it to a transmission shop for a free test drive