thanx for the reply Juday,

I know I have to do the seal change, yes it is the rear and I have to use my truck, I live in the Caribbean and the warranty is not valid here so the Nissan "stealer" says over here.
Low oil level is my immediate concern. I have ordered the 75w140 syntec, comes out of Puerto Rico and Redline is what they have. They only ship oil on a sea going vessel that is why it's 3+ weeks at best. I also ordered the seal, bearing etc. to cure the leak as the stealer here could not even do that along with me making a start on the vent mod I have read on the forum.
So with 3 weeks to go, or more!!

what oil should I put in, top up with, while I wait for the right oil and the seal replacement. If I have to waste a few $$$ on oil and not a whole bunch on the axle replacement I will.