Originally Posted by Wedge1967
We found over the weekend that the AT's with the additional torque start having torque related shift issues 4th to 5th at WOT. Not sure if it's the converter, but I'm looking for a 335d converter. Also want to research the option of going with a ZF26 as a replacement for the ZF19. It's worth looking into.
Is it possible to upgrade ZF19 to ZF26 by changing the internals?