Outback XT 4.44 to 4.11

[Blue Fox]

Hello, forgive me if it’s already common knowledge, but my search hasn’t come up with anything.

 

I have recently swapped my 5-speed Outback XT from its stock 4.44 transmission and rear diff to a low-mileage Legacy GT 4.11. Main reason is that I wanted to run smaller diameter tires since the car is lowered and I’m getting rubbing issues, and the 4.44 transmission has recently blown up.

 

My plan was to swap over the 4.11 and run a LGT size tire so I can not only run a smaller tire, but also have the speedometer show correctly, but it isn’t. It’s off by about the same as the 4.44 was with the smaller tire, leading me to believe there is a box or control unit that needs to also be swapped from an LGT.

 

I believe this may be something to due with a BCM? that needs to be swapped over from a Legacy GT? Is this the right track of thinking for anyone who may know?