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wonder out loud though if the 3.0 Liter Legacy OutBack trans might be beefier than "lesser" Legacy boxes
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You don't want that tranny.
First it requires a different TCU and probably a new wiring harness to go between the tranny and TCU. Second that different TCU will not talk to ECU the same way, you might end up swapping ECU and engine as well.
Second, the tranny is programmed very differently - go drive a 3.0 Outback and you'll understand. It tries to "assist" when braking - it downshifts proactively and tries to engage engine braking messing up any smooth deceleration you are trying to do. I just hate that. Power mode does not seem to exist. Downshifting for acceleration just takes forever. IMHO the 3.0 Outback tranny is just messed up.