can you grease a hub by putting grease into the anti lock sensor hole on the hub.

 

From what I know of the 4wd hubs, they are a sealed unit, and as such, when the bearings go, the whole hub has to be replaced. If you can find someone with a press to disassemble it, replace the bearings and grease them when you put new ones in; then you don't have to replace the hub. You can buy a new hub for about 110 IIRC, and they should only charge you an hour per hub.

 

They are a sealed bearing. You can buy the bearing if you have a press. If not the whole hub needs to be replaced.