Slipping Tranny... Torque Converter???

[190D22]

Here's exactly how it happened... COLD Start up on a COLD night (-10 C), car won't move in reverse without revving high (I backed into the driveway off the street to warm up). Once the engine came down to 750 rpm, I took off and everything seemed normal. Everything normal for about 5 miles/10 minutes in the city then into the country. Then as I was accelerating out of a turn the tranny seemed to down shift way too easily... I press the pedal (not hard enough to down shift normally) and it down shifts and revs high. I make it to my buddy's house, when I went to go in reverse to parallel park it took high revs to move again. I added the 1.5 quarts of fluid I had on hand. No change in performance and it won't move in drive either. I don't know what the level was before because the dip stick (since the tranny was replaced) never seemed to read correct, even the tranny guy was confused on it.
I went in the house and didn't come back to the car for at least 6 hours. It was obviously stone cold again at start up, ambient temp about the same. Thing acted normal for about the same distance and time on the way home the started acting up exactly the same way again. I parked the car on the street and didn't come back to it for at least 3 days. Ambient roughly the same, Start up and head to the same place as before. I make it half as far and now it's really puking! I need to rev it even harder in forward or reverse to make it move. I limp home and take my Jeep from then on. The only time since then I've moved the car was to get it off the street for the snow storm. Stone cold it tool high revs to move it in either direction.

I think it is the torque converter because the tranny shifts fine once I get up to speed... I just takes LOTS of revvs to get there. My logic is: it is taking waaaaay too much input to the tranny to get the desired output. Once the output of the tranny reaches the required speed per the shift linkage position shift point it will shift fine.