[Gravter]

No, no apparent problem leading to this.
I just went and did another test on the tranny/fluid situation. Here are my findings:

- checked the fluid when engine off = high on dip stick
- started engine, let warm up, ran through the gears without much rev, mostly idle
- checked fluid level again with engine warm, huh, same as when cold... hmmm.

So, I'm really starting to think something is blocked somewhere. The fluid might be mostly in the pan and not circulating to the torque converter via the filter.
I don't know the path the fluid goes through, so I could be way off.
I'm gonna get it toed to my local garage and get the fluid/filter changed. I'd do it myself but damn, it's a tight fit under there and I hate my jack stands.
Worst thing that will happen is it'll cost me a filter, oil and some labour (1 hour?) Better than 2+ grand if it works.