[Jowett Engineering]

The cases have the same dimensions, things from one case should fit the other. There are bound to be many internal parts differences, and I doubt you could buy just the Torsen and throw it in there. Input shaft, output shaft, shift forks... what is the same and what is different? I have a feeling by the time you get done it may well be cheaper to buy a whole case. Also do note that Toyota added a large amount of cooling fins to the 200 case. Running that front drive chain constantly creates significant heat.