It switches to anywhere between 60/40, up to 90/10. It's controled by viscous coupling fluid in the diff. It gets hot, expands, providing more pressure. I don't believe the manual or auto is any different.
This is all from a fading memory, but I think I am correct.
MT Open Center Diff 50:50 split.
AT Wet-Clutch Center Diff 90:10 (ish).
Actually, I'm not even sure you can call the AT a Center Diff. It's not even a true diff.
Yeah, I called the MT an Open Center Diff, cuz IMO, that lame Viscous Coupling diff.. is just that... lame!! Sure it works fine for "helping" transfer torque in wet or snow conditions, but it's borderline useless on dry.
@Don, what your friend saw was the limitations of our open & VC differentials. Prior to installing my OBX Torsen Front Diff, at an AutoX, I could easily spin the front inside wheel on a hard corner. Now, it just grabs and turns.