Where do I find a kit to convert to oil, 2011 Big Horn 6000lb axles, do they have sight glass style caps.
I don't know if you would be able to convert your drum brake hubs. I have never heard if anyone makes anything like that.
However if you were to convert to disk brakes, there are seal kits available to convert the Kodiak hubs. They come with a sealing, clear dust cap.
So all you would need is the oil bath seals and some oil.
By the way, there was a recent post here by someone that had the oil bath and had a seal leak.
Lost the oil and then lost the bearing.
Peace
Dave