ok let me clear some faq on this follow up
I have a bit over 13k on this swap
15 up legacy have the same 390 ratio
you can use 15-17 in the swap ( mine was an 17 )
you can use either the og converter or the one from the newer car ( i used the new one and then my engine was replaced for headgasket leaks with a low miles one, converter locater snapped in crank, used the original converter from that point on, it works fine)
You must used the harness, vent tube and top cover from your original 13/14 trans. BE carefull removing it..
You dont want or need to mess with the valvebody. the new ones are fine
Check the axle seals, the plastic caps fugg them up .
everything is direct swap, no mods other than harness, vent tube and top cover swap
you should clear the codes and adaption in the old TCM. ( instructions are online or just have someone with a scanner do it' otherwise it may not work at its best. it will work , mine worked better after it was cleared YMMV)
you will notice when the car is cold, the car will feel sluggish. this is normal,
when the car is warm, it is VERY direct connected feeling..
You will get 24-27 mpg on the highway no problem
If you get codes, you either have damaged the harness or you have loose connections or bad sensors or a bad unit.
make sure you follow up oil change if the trans was outside
Its a good idea to change the radiator as it has a cooler and gets crap in it ( lots came out of mine)
I bought my trans with 6k miles from a scrap yard for $250 in NC like 40 minutes away
Look around...they are CHEAP. Car-parts.com is a great place to look as it lists them by final drive ratio
I am looking for outbacks here with bad transmissions because i can flip them and make a boatload ( all 13/14 cars are common to have bad cvt's)