I don't
think that I would call a torque converter a "servo".
I remember the
phrase "servo" from literature of the time. I have
never owned one, nor have I worked on one. I've only seen them
drive by.
There could very well have been a servo in addition to the torque
converter. I did a lot of engine work, but NEVER worked on VW
transmissions (I had a friend that did, and handed all of those jobs to
him)
There was one fellow who had a bug with auto-shit-stick AND air
conditioning. That was one seriously overworked engine. Switching the
oil cooler to a type 3 and using the >1971 fan housing helped a little,
but not enough.