I did a writeup on I-club about the trannies and torque splits etc.
http://forums.i-club.com/forums/show...hreadid=196455
The MT viscous couling strives to maintain 50/50 torque split but will vary up to 90/10 and 10/90 to achieve that during slippage.
On the 4EATs up to roughly '99 on legacies and '01 on the Imprezas you get 90/10 that can vary up to 50/50. Post '99 and '01 respectively the 4EAT w/o VTD/VDC is 80/20 split and can go to 50/50 when needed.
-mike