The stock configuration for the IIa is open between the swivel housing and hub, so the gear lube will pass back and forth. But if the seal is weak/blown in the axle tube where the half shaft passes in to the axle tube and your axle housing breather is clogged, you'll get pressure build up and it will push the lube out wherever it can.
Or it could be that you just need to reseal your hubs.
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 reg
67 NADA x2
74 Air Portable - The Antichrist (tag 6A666)
95 D1 5-speed
95 D90 5-speed
97 D1 Automatic