can you make a '95 subaru impreza L that has a 2.2l auto trans b 50/50 all the time and how?

Subaru actually uses a 90/10 split for normal driving it would be possible to do it if you got a tranny shop to weld the center diff, nnow the auto's do use a different final drive ratio but that has nothing to do with how fast the auto shifts vs a manual, it has to do with the fact that it's only a 4 speed vs the 5 speed in the manual, they had to go with a numerically smaller (taller) final drive ratio to make up for one less gear at high speeds, the manuals get a numerically bigger (lower) final drive ratio because they have more gears. the gear ratios have nothing to do with how the power is split or how fast it shifts, and the power split is completely controlled by the viscous limited slip differential that works at a 90/10 torque split under normal driving conditions or splits it to a 50/50 when there is to much traction loss.

thank you wikinick... and theres your answer

Yes you can, but the better question is whether you should. Subaru automatics use electric clutches for the center differential (as opposed to the viscous coupling in manual transmission models), and some folks do wire in switches to hotwire the "duty C" solenoid to engage the clutchpack "on demand". The drawback, there's always a drawback, is this can lead to premature wear and failure of components. This is primarily a modification for Subarus used for recreational off-roading and mudding.