Helical center diff

I'm still new so don't be too harsh on me. Could this be modified to use as a center diff, to make the RT4wd into a true AWD? If no or the topic of making our cars true AWD has come up, please point me in the direction.

http://www.ebay.com/itm/88-91-HONDA-CIVIC-CRX-EF-ED-PHANTOM-GRIP-LIMITED-DIFFERENTIAL-HELICAL-LSD-TORQUE-/400430739503?pt=Motors_Car_Truck_Parts_Accessories&fits=Model%3ACivic&hash=item5d3b88302f&vxp=mtr