Dana 44 and a leaky t150

Hello, Ok here is the deal I decided to just wait to build my front 44 instead of rebuilding my front 27. I am using scout front and rear 44 (i only have the rear 44 housing right now). Would it be cheaper to keep my offset 44 rear with my powerlok and then get stronger axle shafts?

BTW I still have a problem with my t150 spewing gear oil out from the top vent. Do you know if there is supposed to be a gasket at the top of the shifter, a full gasket or just a gasket to seal the lip. I am just about fed up with this leaking I am thinking about drilling out the vent, tapping the hole and putting a long tube on it so it can blow it out and then drain right back in. Thanks for all your help