Thanks fellas for the replies.
I have all tools for the job, the only thing missing is a press but did wheel bearing a few yrs ago and can access one (local mechanic) if desperate.
Even bought a ball joint separator from Repco the other day _ always wanted one of these anyway.
Removed the axles some years ago, greased CVs and cannot remember why, maybe was convenience when I changed out the rotars/whl bearing. Interesting though , it is the longer axle with the failed inner axle seal

.
Not too concerned getting amongst it, but the weight of the diff is my concern and no one around to call on to give a hand.
Have some genuine inner axle seal on the shelf (had them for a couple of yrs) and yes the trail-safe have good reputation _ will see.
DIY troll time _ Just other jobs taking priority at the moment _ weighing it all up.
Was mainly interested in the chance of the s/h wiper seals holding back the grease if no oil present.
Thanks again.