I have 2 V70 t5's, 2001, one with a good motor and one with a stuck lifter. I want to swap front sub carriages, motor and transmission and make one good wagon. Should any modules be swapped, or can this be a plug and play?

 

Keep the modules with the original cars.
Don't junk/throw away anything until you know that the running car is running and driving properly.

 

Swap ONLY the "iron"....in our case it's aluminum.
Completely strip-down both engines then just swap the engines.
There are nodes in the body and at least one in the transmission (I assume they're automatics).