Which one?
The one's in the center section, (inboard of the green cup) are lubed by the gear lube in the c-section.
The outers on the end of the half shafts, are greased & sealed about the same as any other front wheel bearing...(every 30,000 mi)
The main difference being the drive flanges, etc, pertaining to the 4wd aspect of the front axle. (as shown in the link Jonnie posted)
There's a service interval chart around here somewhere...
http://www.vehicross.info/modules.ph...warticle&id=26
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