AMC 20 Seals - Questions?

I'm thinking (again) that I need to replace the seals in the AMC 20 rear axle of my 83 CJ7 (wide track).

I understand there are two (2) seals - an "inner" that helps keep the grease/lube in the pumpkin, and an "outer" that protect the bearings and keeps crap from going into the axle tube, and lube inside the tube, etc

I know the outer seal is between the bearing and axle flange (mine are

1-piece Moser's - not the stock two-piece) and the bearing must be pressed off/on the repalce the seal.

But the inner can be replaced after pulling the axle, etc - WITHOUT pressing the bering etc

Questions: In the groups experience - how often has seal failure been the outer seal vs. the inner seal? In other words, which seal is more prone to failure inner or outer? The seal leakage is evidenced by leakage and dust build-up etc on the outside of the brake backing plate etc - the brake wheel cylinders are not the source of the leakage - they have already been checked)

How do I re-fill the pumpkin with lube etc since there is no fill/ drain plugs on the round pumkin cover (Thanks AMC!)

I'm running a full on Detroit locker in the rear. Standard gear oil? Or does it need an additive ... a la a limited slip diff? (I'm thinking standard gear lube - of the approproate weight - is used)

Many thanks

Lynn in Vancouver (getting ready for the annual pilgrimage to TDS)