I know lol, ive never heard that tyhe Silvia rear end fits, until i see for myself that its a bolt on job, then i will recommend it
I have done an AWD conversion and i have a locking splin in my car still which puts the wheels 50/50 or if you disconnect the transfercase/tailshaft it will run 100% power through fronts, that works the same if you disconnect the front shafts to run RWD, but you will still wont totally get 100% due to drivetrain loss, but it will work... and you'll chew ALOT of centre diffs unless u weld it