4WD on Sirion Sport 1.5


I would install the 1.3 Sirion 4wd trasmission on my Sirion Sport 1.5.Do you think it's possible?I've senn that under the car there is clearance to install the rear diff,but i would know if i've to install also the 1.3 gearbox or if it fits on my gearbox.
Thanx a lot