i bought a 88 rx7 s4 model but it also came with a s5 turbo II parts car. The s5 is simply a parts car as it has no papers to register it. Anyway my transmission is dieing in my s4 and i was wondering if the drivetrain is interchangable between the two models. if not what would i need to do. any help appreciated thanks

 

forgot to say my s4 is a n/a model. s5 is a turbo II model