[ShaneHobson]

Replaced faulty transmission in my SVX with a 4.44 from another SVX (originally from a Legacy). Later swapped the rear diff to solve shuddering problem. We didn't know the trans was from a Legacy until after it was fitted.

That all runs sweet.
But, it binds up when turning on concrete. Typically Subaru AWD problem which I understood was fixed by replacing a solenoid in the transmission.
The transmission shop who swapped my trans tell me they replaced the solenoid when they swapped the trans. They looked at the car again and told me the TPS required adjustment, which they did.

Adjusting the TPS seemed to improved (but not solved) the problem for a few weeks, but it seems to have got worse over time.

Was the trans shop dreaming or is there really a relationship between TPS and the transmission ?

Thanks